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Fill a row or column and it clears.

The rest you’ll pick up as you go — including the piece that tells half the truth.

Lab

Playable with a keyboard: arrow keys or WASD move a cursor, 1 to 3 or shift pick up a piece, space or Enter puts it down or sets off a charge. i says what is under the cursor, r turns the held piece in the lab, Ctrl banks a piece in the lab or puts it back, Esc puts the piece down, then the cursor away.