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LOGIC GATES

AND both must be on OR either one will do XOR they must be different NAND an AND, then flipped NOR an OR, then flipped NOT flips it: on ↔ off → straight through, unchanged

You are building the machine, not working it. Tap a gate box to swap what is in it. Tap a switch to flip it and watch the wires light up — that shows you one row of the table. When you think it is right, hit TEST IT and the machine tries every switch position in turn. Every row has to pass, not just the one you were looking at. Computer: SPACE tests, R restarts the puzzle, ESC goes back to the packs.