Tic-Tac-Toe — The Simplest Strategy Game, Explained

Three in a row on a three-by-three grid. Tic-tac-toe is the first strategy game most of us ever learn — and also the first one we outgrow, because with correct play from both sides it always ends in a draw. That solved-ness is exactly what makes it a perfect teaching tool for children. When a child is ready for something that cannot be solved on a napkin, Coridor keeps the same two-minute rule explanation but never runs out of new positions.