Three Letter Tango - Original Puzzles
Some of the squares in the puzzle should have one of three letters (A-C) placed inside them. The number to the left of each row or at the top of each column indicates how many of those squares have a letter. Each row or column contains exactly two different letters, and, ignoring empty squares, the letters alternate. For example, if a row contains four letters, they might read ABAB or CBCB, but not ACCA, ABCA, or AAAA.
Puzzle editing & Web programming by Matt Crawford. Puzzle creation as credited.