Concentration Grid is a web/mobile device app implementation of a mental skills training exercise for students, athletes, coaches, sports performance/psychology staff, trainers, teachers, parents, etc. Use concentration grids a/k/a mental focus grids with student-athletes as a tool for assessment, development, practice/exercise of attention skills ... and for competitive challenge and fun. Generate grids in varying sizes of between 3 and 14 columns/rows - small grids test speed/dexterity ... larger grids exercise focus/attention skills. Convenient gameplay/replay. History tracking (time/performance data). Share feature is integrated with social media. Post and track best gridtimes at the leaderboard. Make self-development a daily habit. #concentrationgrid #challengeyourself - concentrationgrid.com - concentrationgrid.net - tryconcentrationgrid.com