Signal Flip
All gamesPresses 0 / 7Off 7Shortest 4
7 of 8 switches still off. 7 presses left. Cursor on switch A, off, pressed 0 times, even. Pressing it flips A and H.
7 still off. Pressing a switch twice is the same as never pressing it, so the order never matters — what you are looking for is a set of 4 switches, and this board is wired so that exactly one such set exists.
← → ↑ ↓ move along the row · Enter press the switch under the cursor. Every switch you land on shows a dashed edge on the switches it would flip. Click the board first, or press Tab to focus it.