Brain training built around a measurement. Start with an assessment scored out of 100, train in guided 15-minute sessions, then retake the same assessment every eight sessions to see where you stand. 30+ games: Dual N-Back, Stroop, Flanker, Corsi blocks, Object Tracking, and logic puzzles like Sokoban and Untangle. No account, no ads, works offline. 90 minutes of free play, then a one-time payment. No subscription. Launch code: Android & web only; iOS doesn't allow codes.