This combo lock only outputs an ON signal when the required combination of ON/OFF inputs are selected. This can be used for houses, banks, traps and even puzzles.
In this example, the inputs are in the form of 4 levers.
To configure the inputs needed, you simply add or remove torches on the other side of the input blocks (invertors). To use more than 4 inputs, for example 6, add 2 more input levers, and another AND gate at each stage, finishing with a single AND gate.
These are good tutorials.
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