The best alternatives to cotrio are Nuzzle, Dragonbox Algebra, and Numberful. If these 3 options don't work for you, we've listed a few more alternatives below.
Do you like Sudoku? Then play Nuzzle! If you enjoy number puzzle games, it's similar to Sudoku, but a harder game is waiting for you. You should align numbers from top to bottom and from left to right. There is...