How to Play
The rule
Blink back ONLY when both of the opponent's eyes close together. That fully-closed moment is the true window. The tighter your closure syncs with the opponent's, the higher your grade and the more damage you deal.
Feints cost HP
- A single eye closing (a wink) is a feint — do not follow it
- Both eyes only half-closing is a feint — do not follow it
- Blinking outside the true window costs 1 player HP and breaks your combo
Combos
Consecutive hits inside true windows build a combo multiplier, up to ×2.50 damage. Skipping a true window costs no HP but resets your combo.
Your health
You start with 5 HP. Each mistake (following a feint or blinking off-window) costs 1 HP. The first feint mistake each round is protected by a training shield with no penalty.
Calibration
Before your first round, the game runs about eight seconds of on-device calibration to learn your personal eye-open and eye-closed thresholds. This happens locally and is never uploaded.
Requirements
- Desktop Chrome or Edge
- A webcam
- A private, well-lit space
- WebGL, Web Worker, and ImageBitmap support
- Grant camera permission when prompted
Tips
- Watch both eyes, not one
- Stay relaxed — forced staring raises false blinks
- Pause if your eyes feel tired