Freiman Sumset Puzzle Play it here.
Wave Packet Tiling Game Play it here.
Freiman Duel -- Sumset Showdown Play it here.
BMO Function Puzzle Play it here.
Whitney Decomposition Duel Play it here (also the updated version here).
Build convolution of two functions Play it here.
Plunnecke Graph Builder Play it here.
Cauchy-Davenport Sprint Play it here.
Percolation Duel Play it here. This game is inspired by a recent SASA talk by Prof. Michael Damron from Georgia Tech on first-passage percolation. For more information, see the details of the talk here.