A square lights up. A letter is spoken. Does either match what came N steps back?

👁 for position repeats · 🔊 for sound repeats · both can happen. Sound ON is strongly recommended.

Your first run calibrates your starting level — it adapts to find your level — most people land at N=1–2, and you can't fail a calibration.

🔓 Next unlock at Lv 12: N=3 unlocked — Three steps back — elite territory