Iron doors with a password you can easily change. After I made the first password protected door, I was thinking of a way to make it have an easy-to-set password. To make a password in the first one, you have to change some logic gates to make it work. In this one, you don’t have to mess with any logic gates. Each password “bit” have the same logic gate design. They’re all just tied together with 2 NAND gates and 1 AND gate. Fitting them inside this relatively small house was a challenge though.
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