“Bullying” is a term used to describe the aggressive and intentional acts carried out by an individual or a group repeatedly against an individual [1]. Ever since bullying was recognized as a psychosocial problem, several research groups have investigated its causes, as well as possible ways to eradicate it [2,3].

It commonly takes place in spaces where people spend time together (eg, school, work, etc). With the advancement of technology, new forms of bullying have emerged, such is the case of cyberbullying [4]. An example of cyberbullying is online harassment. In this form of digital bullying, the abuser has the advantage of being able to invade the personal space of the person being bullied at a distance, keeping his or her real identity anonymous, which in turn allows him or her to provoke greater fear in the person being bullied [5].

Those who have experienced public humiliation, including bullying and cyberbullying, are considered to be more likely to commit suicide [2]. Therefore, worldwide, multiple programs and initiatives have been carried out to counteract its effects. However, as studies show, this problem continues to grow [6].

According to information presented by the Organization for Economic Cooperation and Development, Mexico has held the first place in cases of bullying at school on various occasions [7,8]. In 2019, the results of the Programme for International Student Assessment test indicated that approximately 19% of students in the country had experienced some form of bullying. Furthermore, it was stipulated that a significant number of suicides committed by children in Mexico were due to cases of bullying, and, unfortunately, these numbers are expected to increase [9].

To contribute to the solution of this issue, we started a new project. A recent analysis of interventions to prevent bullying in schools showed that enhancing interpersonal skills, particularly assertiveness, stands out as the most effective protective factor in mitigating its consequences [10]. With this insight, we decided to develop a solution that promotes said protective factor.

To appeal to a young demographic, we chose to work with serious games [11]. A serious game differentiates from regular games in that they have an additional objective that can be educational or illustrative [12].

To ensure that the protective factor is properly addressed, we made use of the multiple composite scenarios (MCS), a methodology for the design of serious games rooted in principles of cognitive behavioral therapy (CBT) [13]. Unlike other game design approaches, MCS offers a unique blend of versatility and specificity, providing a comprehensive framework for crafting immersive experiences that properly address mental problems. The game we created with it is called Bernstein.

Bernstein is a serious game that promotes the development of assertiveness in high school students. To assess its potential benefits, we carried out an exploratory trial. This paper outlines the findings from this intervention, delving into its benefits and limitations. Furthermore, we discuss our plans for future work aimed at enhancing its overall effectiveness.

Bullying is the deliberate, intentional, and repeated use of force, threats, and coercion to abuse; cause fear or distress; dominate; harm; exclude; and intimidate physically (eg, slapping, hitting, and kicking), verbally (eg, threatening, yelling, and insulting), and psychologically (eg, denigrating and belittling) an individual or a group of people who are unable to defend themselves [14-19]. Bullies (ie, perpetrators of the aggression) usually choose their targets based on characteristics such as appearance, disability, age, race, religion, sex, and so forth [18,20].

People become bullies for various reasons including imitation, having a low self-esteem, or experiencing violence at home [21-23]. The person most affected by bullying is the one who receives the aggressive acts, that is, the recipient. As a consequence of bullying, those who are bullied may develop depression, drop out of school, or commit suicide [2,17,24].

Different actors intervene in bullying in addition to the perpetrator and the recipient, including facilitators (those who join the bully to antagonize others), reinforcers (those who do not antagonize but indirectly support the bullying by either making fun of the target or encouraging the bully), bully+target (those who are both a bully and a recipient of bullying), defenders (those who in some way help the target), and bystanders (those who witness the bullying but do not act accordingly) [25]. It should be noted that these extra actors are not necessarily present on every occasion.

Given its prevalence in modern societies (from 17% to 20.8% in some sectors), bullying is considered a sociocultural phenomenon [15,18]. It is believed that more than 50% of students worldwide have been involved in some form of bullying, as targets, bullies, or bystanders [17].

Some of the strategies that exist to deal with this phenomenon include school programs, institutional policies, rules within the classroom, teacher training, information campaigns, awareness campaigns, discussion forums, workshops, psychological interventions, and educational interventions, among others [15,17].

The type of consequences experienced by the recipients of bullying depends on the severity of the attacks. There are cases in which the recipients do not experience consequences in the mid- to long term. This is due to a series of factors that are directly related to the level of affectation of the recipient. That is, the greater the presence of certain factors, the stronger or weaker the consequences may be. These types of factors are known as risk factors (those that reinforce the negative effects) and protective factors (those that reduce the negative effects).

To learn which factors related to bullying cause the greatest affectation in young students, we conducted a review of the literature. Furthermore, we searched for factors that may help reduce the affectation by this psychosocial phenomenon (ie, protective factors). For this task, we consulted various mental health articles related to interventions carried out in schools [1,2,21-23,25,26].

We found that having a low self-esteem and social isolation are 2 of the most relevant risk factors. In contrast, having a greater number of social relationships, being assertive, and having a high self-esteem were shown to be the most prominent protective factors in reducing the negative effects of bullying. It should be noted that we found that increasing self-esteem is effective in elementary school children but not as effective at older ages. Given that our target audience are high school students, for our project, we chose to focus on the promotion of the protective factor of assertiveness.

Assertiveness should not be confused with aggression, which is the forceful or disrespectful expression of one’s way of seeing things, or the imposition of one’s needs onto others. Assertiveness is an essential, interpersonal behavior that aims to enable individuals to (1) minimize power differences that may exist with others; (2) act in their own best interests; (3) stand up for themselves without undue anxiety; (4) express their beliefs, concerns, feelings, interests, needs, opinions, point of view of things, and personal rights honestly; (5) exercise their rights; and (6) share privately held information with people in a position of authority [27-29]. This while respecting and acknowledging the rights of others.

Ours is not the first project that aims to address a psychosocial issue such as bullying by making use of a video game. Video games offer players the opportunity to try different paths and learn different points of view and perspectives in digital environments [30]. For that reason, it is believed that they are capable of promoting behavior change, problem-solving, and acquisition of skills.

The main goal of commercial video games is to entertain. Games whose purpose goes beyond entertainment are referred to as serious games. Serious games differ from commercial games in that they have an additional objective [12]. Among the objectives that these usually pursue are raising awareness, teaching, training, changing perceptions, persuading, promoting skill development, improving attitudes, instilling positive attitudes, nurturing player empathy, and so forth [16,18,30-41].

To achieve this goal, serious games make use of formal strategies and techniques. Such is the case of serious games for education, which make use of pedagogical methodologies to teach a concept or skill [42]. Other topics covered by serious games include caring for the environment, mental health, and sports, among others [11,13,43,44].

There are various game titles related to the subject of bullying. StopBully is a serious game that through role-playing puts the player in the role of recipient or bystander, thus simulating real-world situations [16]. Its objective is to prevent bullying by helping recipients improve their behavioral competence to avoid or face situations [39].

Conectado is an educational game that seeks to increase awareness among young people about school bullying [31,32]. This title puts players in the role of recipients with the aim of fostering in them empathy with those who are bullied.

FearNot! is a serious game that takes place in a virtual school with characters typical of everyday school life (eg, bullies, recipients, bystanders, and helpers) [35]. Its goal is for players to observe bullying scenarios and interact with the recipients, as well as advise them on the best way to deal with the situation.

Stop bullying now! is a serious game whose goal is to enable caregivers of people with disabilities to learn how to respond to bullying situations [18]. To do this, it presents different characters and situations, such as children and adults with disabilities, parents, teachers, supervisors, and bullies who show different bullying behaviors.

Happy Class is a role-playing game (RPG) in which students experience the role of bullying bystanders through chat [41]. Its goal is for players to understand the seriousness of the damage caused by cyberbullying and the important role of bystanders while learning how to prevent further violence by taking appropriate action.

The game studio Disparity developed and published an indie title that covers the topic of bullying called “Ninja Pizza Girl” (NPG). NPG narrates the story of a 16-year-old girl named Gemma, who works in her father’s business delivering pizzas and who is forced to face “the most ruthless enemies a teenage girl can have: other teenagers” [45]. Throughout the story told in NPG, topics such as self-esteem, bullying, and resilience are discussed. Enemies in this game attack the player through insults and taunts. An interesting detail about the production of NPG is that part of the team that worked on the game had previously been a recipient of bullying [46].

A Day at my School is a serious game developed with Unity that highlights the perspective of a bystander and that presents a situation in which the abuser becomes the recipient. This title consists of 2 stages whose objective is to raise awareness and motivate the player to report bullying when the situation arises [47]. It should be noted that this serious game is available for free on the web.

A research group at Leuphana University presented the conceptual design for Bully you, Bully me, a serious game that asks players to enact scenarios of bullying to make them reflect about the consequences of their actions [48].

There are also commercial games that deal with bullying. Such is the case of Bully, an action and adventure game set in an open world environment [49]. In Bully, the player plays a 15-year-old teenager who can decide whether or not to harass others and see what effects and consequences his actions have. It should be noted that its effectiveness in preventing bullying has not been tested.

In general, serious games that address bullying tend to (1) simulate real-world scenarios; (2) present cases of bullying; (3) provide recommendations; (4) ask the player to take action (eg, supporting the recipient of bullying); and (5) optionally, encourage reflection. Furthermore, several of the titles presented here contemplate their use as part of an intervention in which a teacher or a guide uses them as an example to invite participants to dialogue and reflect on it.

Among the limitations of the aforementioned examples are (1) little variety of scenarios or narratives, (2) little variety of devices on which they are available, (3) little variety of actions that they allow players, and (4) type of audience to which they are directed (mostly children and young people).

Inspired by other games that seek to contribute to the mitigation of bullying, we decided to present realistic scenarios that allow players to act and reflect on it. However, unlike them, we decided to (1) create a game that would present different scenarios (eg, bullying between people in the same family and professional bullying), (2) work on a prototype that can be used on different devices, (3) increase the number of actions a player can perform, and (4) create a game that is interesting for young and older players. Another key distinction is that, to the best of our knowledge, our serious game is the only one explicitly designed to promote assertiveness in players as a strategy to mitigate the impact of bullying they may experience. In other words, Bernstein uniquely frames assertiveness as a practical tool for building resilience against bullying, rather than treating it as a stand-alone skill or ultimate objective.

Assertiveness refers to a person’s ability to (1) communicate with others in a clear, firm, positive, honest, direct, and balanced way; (2) stand up for his or her own beliefs without limiting or attacking others; (3) meet his or her own needs and concerns; (4) demonstrate certainty in his or her actions; (5) express what he or she feels and thinks, even if it results in negative consequences; (6) be direct in asking for what he or she wants or needs; (7) behave confidently; (8) be sociable and active; (9) take control of his or her life; and (10) being frank [50-57]. This differs from aggressiveness in that an assertive person does not seek to impose himself or herself or harm others to achieve his or her goals. Assertiveness is commonly linked to job success, as well as personal growth and development [54,55].

Adolescence is a pivotal stage for socioemotional development, during which young people navigate complex identity formation and peer dynamics. In this process, the ability to express thoughts, needs, and emotions clearly—especially when faced with peer pressure or conflict—becomes essential. Assertiveness equips adolescents with the confidence and resilience to advocate for themselves while fostering positive relationships [27,58]. As a key protective factor, it may not only help reduce the risk of bullying but also enhance academic performance and strengthen social connections.

There is a wide variety of game-based approaches that seek to contribute to the development of assertiveness in players. Such is the case of the model presented in the study by Cheong et al [52] for conflict resolution, which is based on balancing the assertiveness and cooperation of users. In the study by Hendrix et al [59], a proposal is presented to use games to increase children’s social competence, encouraging them to talk about their needs. In contrast, in the study by Eng [60], a learning strategy based on games is disclosed to teach assertive communication and improve team play. van der Lubbe et al [61] created a serious game to train the verbal resilience of the players, in order to avoid scams. Finally, in another study by van der Lubbe et al [62], a proposal for the use of serious games is presented to empower vulnerable groups by promoting the development of skills such as assertive communication.

In general, these approaches are characterized by presenting activities that (1) promote the development of an interpersonal skill (eg, assertive communication) and (2) allow players to practice said skill through game scenarios. Unlike these examples, our approach goes beyond fostering a single skill; it aims to encourage holistic improvements in players’ mental health by enhancing their cognitive and behavioral patterns.

To explore the effects produced by our game, we compared Bernstein with an alternative protocol in a controlled intervention. For this purpose, we made use of a specialized instrument to measure assertiveness. In addition to that, to learn about the participants’ experience, a brief survey was conducted. With the information that we obtained, a quantitative analysis was conducted. To report our results, we followed the guidelines presented in the study by Montgomery et al [65].

The study received prior approval from the Universidad de Colima ethics committee. All participants provided informed consent, confirming that they had read and understood the study’s purpose, procedures, potential risks, and their right to withdraw at any time without consequences. Participant data were collected and processed anonymously to ensure privacy. Students were informed that participation was voluntary, with no financial or material compensation provided.

A total of 46 students completed the intervention in the treatment group. To protect their personal information, we assigned each an identification code, which we used consistently throughout the study (T1-T46). The scores they obtained before and after playing can be seen in Table 3. To observe the effects produced by Bernstein, we compared the pre- and posttest scores of the participants using an inferential statistical test. The instrument we chose for this purpose, based on experts recommendations, was Student 1-tailed t test for paired samples [73,74]. Also known as the paired 1-tailed t test, this instrument was used to compare participants’ pre- and postintervention scores and assess the statistical significance of the observed differences. We established the following null hypothesis: there is no difference between participants’ scores before and after engaging with Bernstein. As shown in Table 3, the analysis yielded a P value below .05, suggesting that the intervention likely influenced the outcome.

A total of 46 students completed the intervention in the control group. To protect their personal information, we assigned each one an identification code, which we used throughout the study (C1-C46). The scores they obtained before and after playing are shown in Table 3. To observe the effects produced by the alternative protocol, we compared the pre- and posttest scores of the participants using an inferential statistical test. The instrument we chose for this purpose was also Student 1-tailed t test for paired samples. The null hypothesis that we established was the following: there is no difference between the results of the participants before and after participating in a YPR session. As shown in Table 3, at P<.05, we obtained a statistically significant result.

Following expert recommendations, we conducted a one-way ANOVA [73,74]. This analysis allowed us to compare the effectiveness of Bernstein and the alternative protocol by examining differences in score improvements between the 2 groups. The data that we used as input for this calculation were the average of the effects observed in both groups (ie, difference between pre- and posttest scores). The null hypothesis we established was the following: there is no difference between the results produced by Bernstein and the alternative protocol (ie, YPR) in the development of interpersonal skills related to assertiveness.

Table 4 shows the results of our calculations. The columns included in this table are sum of squares, degrees of freedom, mean square, F ratio, and P value of the null hypothesis being true. As Table 4 shows, at P value of <.05, there is a statistically significant difference between the 2 interventions, with the results favoring Bernstein.

To learn more about the impression that participants had of Bernstein, we asked them to respond to a form with both open-ended and 5-item Likert-scale questions (with 1 being totally negative and 5 totally positive). As the results suggest (Table 5), in general, participants enjoyed the intervention and had a pleasant experience. The highest rated factors were the language used in the game and the scenery design. The factor with the lowest score was the usability. When asked what suggestions they had to improve Bernstein, students mentioned the following: adding a checklist of the activities the character must do, including directional arrows to guide the character, adding more engaging sound effects, including side quests to improve the player’s game stats, and adding a navigation map.

Bullying is a serious psychosocial problem that affects a significant number of young people. To help mitigate its consequences, we created Bernstein, a serious game that promotes the protective factor of assertiveness. To assess its effects, we carried out an exploratory trial with students from local high schools. As the results show, with P<.05, we obtained statistically significant results, confirming the feasibility of promoting assertiveness through Bernstein.

In contrast, despite having obtained a statistically significant value, the effects of a single YPR session (the alternative protocol) were moderately negative. YPR was originally designed to be delivered over multiple sessions, so compressing it into a single session likely contributed to its limited impact. Future research should explore alternative delivery protocols, including cumulative sessions, to better enhance assertiveness outcomes.

One way to estimate the effect size of an intervention, including those that seek to promote the protective factor of assertiveness, is to determine Cohen d for the values measured pre- and posttest [28,29,75]. Results of d can be interpreted as follows: 0.5 as small, from 0.5 to 0.8 as medium, and those 0.8 as large. For Bernstein, we obtained a Cohen d of 0.15885. These findings are consistent with results from similar interventions [28,29]. Although the effect size may be classified as small, research suggests that even modest improvements in assertiveness can yield meaningful real-world outcomes. Assertiveness enables students to resist peer pressure, navigate interpersonal conflicts, and express personal boundaries effectively, without resorting to aggression [29,57]. Consequently, incremental yet sustained gains in assertiveness have the potential to enhance resilience, strengthen peer relationships, and reduce the risk of bullying incidents.

To assess participant experience, we used a brief Likert-5 questionnaire. The highest rated features were language (4.43) and scenery design (4.17), while usability (3.63) and activities (3.72) scored lower, pointing to areas for improvement. Participants suggested adding activity checklists, directional arrows for navigation, and more engaging sound effects. These insights highlight key opportunities for future iterations. Improving usability will enhance player experience and better align game mechanics with mental health goals. Planned updates include clearer visual cues such as in-game maps, side quests to foster autonomy, new branching storylines to provide more opportunities for practicing assertiveness in varied contexts, and redesigned activities to sustain engagement and motivation.

While our study demonstrated the feasibility of promoting assertiveness through Bernstein, conducting the trial remotely introduced limitations. Without in-person guidance, participants missed opportunities for immediate feedback, which could have enhanced engagement. Real-time facilitator support, available in face-to-face settings, would allow for clearer guidance, encouragement, and correction during gameplay.

Although remote execution ensures safety and accessibility, follow-up studies should aim to compare remote and in-person interventions to better understand how delivery mode influences outcomes. A hybrid approach may ultimately strengthen Bernstein’s impact and scalability.

Another limitation of this exploratory trial is the relatively small sample size of the intervention, which restricts the generalizability of the findings. Future interventions with larger, more diverse participant groups are necessary to strengthen external validity and provide more conclusive evidence of Bernstein’s effectiveness.

Bernstein simulates realistic social situations, allowing players to practice expressing needs, setting boundaries, and managing peer pressure—skills directly relevant to school and social environments. Future research should explore the real-world impact of these skills through longitudinal studies, follow-up assessments, or hybrid interventions that combine gameplay with guided reflection or role-playing exercises.

While the RAS is a reliable tool for measuring assertiveness, its scope is primarily limited to behavioral expressions (ie, without explicitly evaluating underlying thought patterns or decision-making processes). Incorporating complementary metrics (eg, resilience, empathy, and cognitive or emotional regulation scales) would provide a more holistic assessment of Bernstein’s impact. Future studies should explore these additional dimensions to gain deeper insights into how the game influences players.

Bernstein is not the first serious game that seeks to contribute to the solution of the problem of bullying. Although there are other examples, to our knowledge, it is the only title that focuses on promoting the protective factor of assertiveness for that purpose. Future experiments with larger samples will be crucial to compare Bernstein’s effectiveness with other interventions and to validate its distinctiveness.

The results obtained through the application of MCS were satisfactory. In its current iteration, it offers a comprehensive framework that facilitates the design of games capable of promoting protective factors as well as reducing risk factors, all while maintaining a targeted focus.

While serious games offer many benefits, they often fall short in replicating the complexities of real-world scenarios [76]. MCS, however, empowers creators to design games that more effectively capture and simulate nuanced, multilayered situations. As demonstrated in this study, it has proven to be an effective tool for crafting settings that reflect real-life challenges, enabling a more immersive and impactful experience for players.

We also identified areas for improvement. The Love Coin system functions as a cognitive-behavioral feedback mechanism, rewarding actions aligned with the game’s therapeutic goals. However, it may unintentionally bias player choices by encouraging reward-seeking over authentic exploration, leading players to prioritize earning coins over experimenting with diverse responses. This can limit deeper learning and reduce the sense of freedom, affecting the realism of their recovery journey. Future versions could implement more balanced scoring, rewarding effort, exploration, and varied strategies to promote meaningful engagement.

Furthermore, we assessed the benefits of implementing MCS for a specific issue. To ascertain its effectiveness to address different mental problems, additional validation would be required.

Bullying, characterized by physical, verbal, and psychological aggression, continues to pose significant challenges in educational settings worldwide. As official data suggest, Mexico holds the highest global incidence of school bullying. This highlights the urgency of finding innovative and effective solutions to mitigate its impact on students’ well-being.

In response, we developed Bernstein, a serious game aimed at promoting assertiveness—identified as a key protective factor against bullying. Through the MCS methodology, grounded in CBT principles, Bernstein provides an interactive and immersive environment for players to develop interpersonal skills. The results of our intervention suggest that the game is a feasible tool for fostering assertiveness, with statistically significant improvements observed at P<.05.

While these findings are promising, it is essential to explore Bernstein’s efficacy in comparison with other bullying prevention interventions. Existing approaches, such as assertiveness training workshops, institutional awareness campaigns, and teacher-led interventions, have shown varying degrees of success. However, Bernstein offers a unique, scalable, and engaging alternative through a serious game, which may appeal to adolescents and allows them to practice assertive behaviors in a safe, controlled environment.

The potential for broader impact lies in integrating Bernstein into school curricula. Unlike traditional interventions that rely heavily on lectures or role-playing exercises, Bernstein immerses students in realistic situations, enabling experiential learning at their own pace. Furthermore, the game could complement other antibullying strategies, such as peer mentoring or mental health support services, providing a well-rounded toolkit for educators.

Future research should focus on expanding Bernstein’s implementation across diverse educational settings to evaluate its long-term impact and scalability. Collaborating with schools to integrate the game into regular curricula would allow for a more comprehensive evaluation of its effectiveness. Furthermore, comparative, “in-the-wild” studies with other antibullying programs could yield insights into how serious games such as Bernstein stack up against conventional interventions in promoting assertiveness and reducing bullying incidents.

The findings presented here showcase the feasibility of using Bernstein to promote assertiveness. While further validation with larger samples is needed, the results offer promising evidence that game-based interventions can play a meaningful role in mitigating bullying. With proper support and integration into educational practices, Bernstein has the potential to become a valuable tool in the ongoing effort to combat bullying and foster healthier school environments in Mexico and worldwide.