Circuit: 1/10
Score: 0
Best: --

Logic Gates

Buffer wired up a bulb through AND, OR, XOR and NOT gates. Flip the switches so power reaches the bulb.

How to play

Tap a switch to turn it ON or OFF.
AND needs both wires on · OR needs one · XOR needs exactly one · NOT flips.
Press Power on. A miss shows a 1 or 0 on every gate, then you get one more try.
Light it on the first try to climb a level: more switches, more gates.

10 circuits · 2 tries each · every circuit has at least one answer

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Logic Gates

Ten circuits of AND, OR, XOR and NOT gates. Flip the switches and press Power on: light the bulb in two tries or fewer. Every circuit is checked to have an answer, and first-try solves climb to bigger circuits.

10 circuits
Logic

How to play

Flip switches. Each switch sends power (1) or not (0) into the circuit.
Know the gates. AND needs both inputs on, OR needs one, XOR needs exactly one, NOT flips its input.
Power on. Two tries per circuit. A miss shows a 1 or 0 on every gate so you can trace the problem.
Climb. Light it on the first try to get more switches and gates next time.

Quick tips

Work backwards. Start at the bulb: what does the last gate need from its two wires?
AND needs everything. Every input of an AND must be on. One off wire is enough to stop it.

3 more tips in the Logic Gates guide →