Bring both portal halves together
Use the arrows until the red and green pieces form one complete portal.
Use the arrows until the red and green pieces form one complete portal.
12 gates · about 3 minutes · earn up to 32 ★
Each eye receives complementary portal pieces. Opening every gate requires information from both channels. Your settings are remembered for next time.
If this message remains, download the HTML and open it in Safari or Chrome; attachment previews can block games.
Each eye receives part of the portal. Keep both visible; neither piece is enough by itself.
The timer and alignment controls are stopped.
Choose 0 for comfortable or 5 for significant discomfort. This records symptoms; it does not diagnose them.
“Largest separation” is a game setting measured in screen pixels, not a clinical vergence measurement. Share symptoms and results with your clinician if they use this exercise in your plan.