SPIN

Level 01 · Forty-Two. Six rings on, two moves to choose from at every step, and forty-two of them. One of the two is always wrong.

1. 01Tap a ring to lift it off the bar, or to drop it back on.
2. 02Only two rings can ever move: the one at the free end, and exactly one other.
3. 03LEFT is the moves still to come, exactly. Get every ring off and it reads zero.