A 4-digit number flashes for a split second — then vanishes.
Can you remember it? Test your visual memory and reaction speed.
Simple to learn, nearly impossible to master.
A 4-digit number flashes on screen
It vanishes almost instantly
Enter the number from memory
Each correct answer makes it faster
Every correct answer shaves 60ms off your time. How far can you go?
No distractions, no timers — just you vs. the flash.
Consecutive correct answers earn bonus point multipliers.
Compete for Top 3 worldwide and track your best scores.
Beautiful dark UI with a friendly brain mascot.
Play anywhere, anytime — no internet required.
Train your brain in short, focused bursts.