Players
Two

Materials
Six markers, three each of two kinds

Object
To get three markers in a row horizontally, vertically, or diagonally.

Rules
1. Each player has three identical markers. Players take turns placing their markers into any empty square in the grid.
2. If neither player has three in a row once all of the markers have been placed, the game continues by sliding the markers.
3. Markers may slide horizontally or vertically into any adjacent empty space. Markers may not move diagonally.
4. Play continues until one player succeeds in getting three markers in a row.