Copyright (c) ? The Montgomery Schoolhouse Co.
This game is played on the following board(s):
Any player can slide any 2x2 area into the empty area. In this example, the first player moved the upper middle area into the center.
Stones may move to adjacent empty cells, even to adjacent 2x2 areas, like the marked blue stone.
In this position, Red won the game since every 2x2 area has a red stone.