Sudoku goes Classic consists of four games that are reimplementations of classic abstract strategy games in which Sudoku-type rules constrain movement and placement of pieces. The games are Halma (Chinese checkers on a square grid), Vierer (4-in-a-row), Revers (Reversi/Othello), and Score (Attaxx). Game components consist of a 6x6 grid, 36 double-sided counters (black/white on each side) bearing a number between 1 and 6, and 12 double-sided blank counters, which are mainly used to fill spaces that cannot be used because of Sudoku rules.