The proposed study aims to investigate the effects of children's in-home engagement with a biofeedback video game-based intervention on children's in-school behaviors. For the proposed study, families with no prior Mightier exposure will engage in online gameplay for eight weeks. Mightier will recruit families through social media and clinical settings, then Mightier will randomly assign participants to one of two groups: a group in which the child participant is encouraged to play Mightier games with biofeedback elements 45 or more minutes a week, broken into 3 or more sessions a week soon after baseline data have been collected, and a group in which the child participant receives Mightier and is invited to play Mightier games with biofeedback elements after all study baseline and follow-up data have been collected. The investigators will aim to enroll 20 parent-child dyads in each group.

Specific Aims and Hypotheses:

1. Demonstrate that child engagement in Mightier biofeedback video games is correlated to child improvement in school behaviors. The investigators hypothesize that teachers of child participants will report reductions in child school behavior challenges after 8 weeks of child Mightier gameplay.
2. Demonstrate that child engagement in Mightier biofeedback video games is correlated to child improvement in at-home behaviors and general improvement in emotion regulation. The investigators hypothesize that parents of child participants will report a reduction in child behavior challenges and improvements in child emotion regulation after 8 weeks of child Mightier gameplay.

Study Design:

A randomized controlled trial comparing pre- and post-measures for a group in which child participants play Mightier video games for the active 8-week study period (Mightier Now group) to a group in which child participants wait during the active 8-week study period, then play Mightier after post-measures are collected (Mightier Later group).

Study Sample:

40 parent-child dyads in which the enrolled children are between 6 and 11 years old, have no prior Mightier experience, and attend school outside the home; 40 school teacher informants, who will complete baseline and follow-up measures on behalf of enrolled children.

Study Aims:

Aim 1. Demonstrate that children's in-home Mightier play is associated with reduced in-school emotional and behavioral problems. The investigators hypothesize that teachers will report reductions in child participants' school emotional and behavioral challenges after 8 weeks of child Mightier gameplay at home.

Aim 2. Demonstrate that children's in-home Mightier play is associated with parent-perceived reductions in child emotional and behavioral challenges and overall improvements in child emotion regulation. The investigators hypothesize that parents will report reductions in child participants' emotional and behavioral challenges and improvements in child emotion regulation after 8 weeks of child Mightier gameplay.

Recruitment Participants will be recruited to the study via social media ads, emails to families who have inquired about Mightier research studies, and clinician and educator referrals.

Screening Families who are interested in enrolling in the study will complete screening via an online questionnaire form to screen for inclusion and exclusion criteria.

During study screening, families will be given a link to share with their child's school teacher, along with sample language that families can use to inform the teacher that the family would like to participate in a research study, that the study requires data at baseline and Week 8 from questionnaires completed by a teacher who sees the student regularly.

Teachers who use the link provided by families who are interested in the study will link to a web page providing information about the research study and asking is the teacher is willing and able to complete study measures.

If children meet inclusion/exclusion criteria and teachers are willing and able to complete questionnaires, then parents/guardians and child participants will be invited to schedule a video call to complete study informed consent and assent forms.

Baseline data collection Parents and teachers will complete baseline questionnaires via online form.

Randomization After baseline questionnaires for a child participant are completed by parent and teacher, the child's family will be randomly assigned to the Mightier Now study cohort or the Mightier Later study cohort.

Before enrollment starts, a randomization list 60 subjects long will be created. Participants will be assigned to groups per this list, in the same order in which participants enroll in the study.

Intervention Families in the Mightier Now cohort will receive a Mightier shipment via UPS and will be directed to encourage child participants to play Mightier in their homes on an ad lib basis for eight weeks. Families in the Mightier Later cohort will be advised that their Mightier shipment will arrive after Week 8 questionnaires have been completed by a parent and teacher of the child participant.

Study check-ins Research staff will check in with families at weeks 0, 2, 4, and 6 of the study.

Study check-ins will consist of:

An email from research staff acknowledging child cumulative Mightier play minutes and encouraging ongoing play, Mightier gameplay engagement support, and links for scheduling study phone calls or zoom calls, at the discretion and preference of study participants.

Safety monitoring Participant safety will be assessed at study visits. Adverse events will be monitored and recorded. Concerns about participant safety will be reviewed by a clinician-on-call, a licensed clinical social worker, who will aid with referrals to local authorities as necessary.

Follow-up data collection Parents and teachers will complete follow-up questionnaires via online form as close as possible to 8 weeks after start of play.

Duration of treatment:

8 weeks of use ad-libitum. Parents in the Mightier Now study cohort will be encouraged to have their children play Mightier games at least 3 times a week / at least 45 minutes per week of Mightier play for the 8 week duration.

Parents in the Mightier Later study cohort will be reminded that they are in a "wait list" cohort, and that their Mightier shipment will arrive after parents and teachers complete the baseline and follow-up questionnaires.

Inclusion Criteria:

• Age 6-11 at the time of screening
• Attending school outside of the home and not planning to change schools or classrooms during the 8-week study period

Exclusion Criteria:

• Prior Mightier use
• Out-of-home School Teacher unable to complete baseline and follow-up questionnaires
• Planned medication changes during the 8-week study period
• Parents encouraged to self-exclude if their children have severe skin sensitivities
• Parents encouraged to self-exclude if their children are pre-readers

Enrolled family random study cohort assignment will be masked from school teachers, who will complete outcome measure questionnaires about enrolled child participants at baseline and follow-up.