- Directional arrow speed reflex game testing cognitive reaction time
- Color-coded rule system: Red requires opposite direction, Green requires matching direction, Yellow requires ninety degree turn
- Dual input support allowing both on-screen directional buttons and full-screen swipe gestures
- Accelerating round countdown timer decreasing from 2000 milliseconds down to 420 milliseconds
- Consecutive streak combo counter triggering Fever mode visuals at 10 consecutive correct inputs
- Millisecond-precision reaction time tracker calculating average response latency per session
- Brain age estimation score displayed on game over result screen
- Two-player split screen duel mode playable locally on a single device
- Haptic vibration patterns and audio tone signals on correct and incorrect inputs
- Session statistics summary displaying final score, reaction time, and rating
Respond to directional arrows using reverse and color-coded reflex rules.