Glad it exists, hope it keeps improving – NSA CryptoChallenge Review

This is fun, but I'd like to see these improvements: 1) Better entry methods/UI. I'd rather click a character position and then type the mapped letter. If a letter is used, clear it when reused. 2) Harder puzzles - no punctuation, then no spaces, then Vigenère ciphers. 3) Include letter frequency analysis tools (at selectable key lengths) 4) Control the screen brightness. On harder puzzles, the screen dims as you take time to study.
Review by jk12345678901 on NSA CryptoChallenge.