This document is an instruction manual for a game to help train distinguishing between similar sounds. It presents pairs of words that differ by only one sound (such as "f" and "v") and asks the player to select which word they see from two options by clicking on it. The game provides feedback and aims to help the player better discriminate sounds like "f" and "v", "t" and "d", "s" and "z", "c" and "g", "b" and "p", and "m" and "n".