The Wrong Key

Memory · Odd one out

Every key looks the same. One of them won't turn.

Each board is a grid of keys. All of them share one cut except one. Read the five teeth along each row and tap the key that differs. Early boards have a tooth two notches off. Later the gap shrinks to one notch, then only the middle teeth. On the last boards every cut matches, so look at the hole in the round end. A wrong tap shows you its teeth beside the rest and never costs points. Find fast and clean for a bigger score. Clear all ten boards.