RecruitingDevice studyFeasibility/Acceptability of Attentional-Control Training in SurvivorsThis is a multicenter pilot randomized controlled trial, with an active control condition, of the feasibility, acceptability, and preliminary efficacy of EndeavorRx in a cohort of survivors of acute lymphoblastic leukemia or brain tumor ages 8-16 who are \> 1 year from the end of therapy.