Tap code is an unencrypted 5x5 cipher, typically with C & K combined, rather than I & J or U & V, as is common in other such ciphers.
Puzzles
MIT Mystery Hunt 2013 Magic: The Tappening
MIT Mystery Hunt 2022 Drive-Thru Dilemma
MIT Mystery Hunt 2024 This Space Intentionally Left... Well, You Know
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