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The Ultimate Mental Reflex Challenge
Every level hands you one rule and a three-second clock — how fast can you think? 45 levels, global leaderboards, Formula-1 scoring. Free on iOS and Android.
Free to play · No account needed to start
+ Stack numbers higher than
the last stacked card
← snap · → stack
You just played level 2. There are 44 more, and every one changes the rule.
Every level rewrites it. Stack blue cards. Stack consonants. Stack numbers bigger than the last one. Nothing carries over.
Cards keep coming and the timer doesn't wait. Match the rule? Stack. Doesn't? Snap. One wrong move ends the streak.
Every level has its own global leaderboard with Formula-1 scoring — P1 takes 25 points, P10 takes 1. Race for the top.
The rule changes under you 45 times.
Colors, letters, numbers, shapes, words, memory. Each level swaps the logic, so the skill that got you here won't carry you through the next one.
Finish a level in the top 10 worldwide and score like a Grand Prix: 25 points for P1 down to 1 for P10. Every run is a race.
Not one board — 45. Find the levels that fit your brain and defend your position against players everywhere.
A terminal-green dark theme built for late-night streaks. Try the toggle in the corner of this page — it's the same one in the game.
Free on iOS and Android. The leaderboard won't fill itself.
