St. Patrick’s Pattern Detective is an interactive St. Patrick’s Day math game for kindergarten through second grade students, targeting core early algebra skills through pattern recognition and error correction. Students examine a complete repeating pattern, identify which cards the leprechaun scrambled, and select the correct replacement — building the foundational reasoning skills underlying algebraic thinking. Available in Easy (1-mistake, AB patterns), Medium (1-mistake, AAB/ABC), and Hard (2-mistake) modes, the game regenerates across three rounds per session and includes a built-in hint system for scaffolded support. Aligned to Common Core Standards for Operations and Algebraic Thinking (K.OA, 1.OA) and NGSS crosscutting concept of Patterns, St. Patrick’s Pattern Detective is as useful for differentiated small-group instruction as it is for whole-class interactive play.