Featured Game · Cognitive Speed
Changing
Doors
Choose the right door. Trust your instincts. Step into the unknown.
Which door calls to you?
Select a level below, or begin from the start. React quickly — every millisecond matters.
✨
Right door!
Keep going…
🚪
Uh-oh…
Wrong door. The path closed.
🌙
Level Complete
You've passed through.
⏳
Time ran out
The door swung shut.
Your Reaction Map
Reaction times per round · this level
Why this game?
"Changing Doors trains perceptual speed and decision-making — the cognitive skills that open every other door in life."