Got stuck at the NAND gate level.
Stick with it! Hint: A NAND gate is an AND + NOT circuit. It outputs a 0 when both inputs are a 1, otherwise outputs a 1.
Same, I built a correctly-working AND gate made only of NAND gates but the tests don't pass.
Stick with it! Hint: A NAND gate is an AND + NOT circuit. It outputs a 0 when both inputs are a 1, otherwise outputs a 1.