Tap code trainer

_


Cheat sheet

12345
1ABCDE
2FGHIJ
3LMNOP
4QRSTU
5VWXYZ

Every letter is knocked in two groups, first y, then x. This means the first column can be memorized and counted along during the first group, and then the following part of the alphabet can be counted during the second, to get to the letter that's knocked.

C (. ...) also represents K, because there isn't enough space for all 26 letters.