Mind Games for 2 Player Game

Choose your favorite mind game to play. You can both practice your mind and play games in the same time. How convenient!
Chess: It is played 1 or 2 player, difficulty levels, 2D/3D game view options
Tic Tac Toe: Played single or two player and you can create 3x3, 5x5, 10x10 boards.
Checkers: 2 or 4 player game mode and crossed style game feature.
Connect 4: It is played either single or two player and you can define line and column.
Snake and Ladders: It is played by 1 player or 2 player or 3 player or 4 player.
Mancala: It can be played by 1 player or 2 player, difficulty levels and different game themes.
Math: 1 or 2 player feature, difficulty levels and question types (Addition, Subtraction, Division, Multiplication)