Four Corners is a two-player geometry game. Kids take turns placing tiles on a grid and try to be first to complete a square, playing against a friend or the bot.
Each turn is a spatial decision: which points can become corners, how a new tile opens or blocks a square, and whether to build your own shape or stop the other player. That practice is about squares, equal sides, and seeing figures on a grid, not about speed drilling.
PlayMath.org and the Julia Robinson Mathematics Festival have partnered to bring some of the real-world activities from the math festivals to life online. JRMF is a nonprofit that hosts non-competitive math festivals, where K–12 students explore hands-on puzzles together.