St. Patrick’s Pattern Unit Counter is an interactive St. Patrick’s Day math game for kindergarten through second grade that develops students’ understanding of pattern structure by asking them to construct exactly three complete units of a given repeating pattern. Across three simultaneously displayed workspaces — Easy (AB), Medium (AAB), and Hard (ABC) — students build patterns card by card using a shamrock, gold coin, and rainbow palette, with each unit visually bracketed and labeled so students can see how a pattern is made up of repeating groups. Targeted error feedback identifies the specific unit and position of any incorrect card, reinforcing the concept of unit integrity in a pattern. Aligned to Common Core Standards for Operations and Algebraic Thinking and state frameworks emphasizing pattern structure and repetition, this game makes the abstract concept of a “pattern unit” concrete and hands-on.