Here is Domina 4. Be careful, it may cause a headache!

Domina 4 Components:

• 25 square tiles in 5 colors (5 each).
• 5 black pawns.
• 5 white pawns.

The 5x5 board is a random configuration of 25 colored tiles. The tiles are placed in such a way that no two tiles of the same color are orthogonally connected. Note: For math enthusiasts, this is called a `Latin Square` or an `Euler Square`.
In the `Knight Cover' variant, the tiles are placed in such a way that all tiles of the same color are a knight's move apart.

The game consists of the following two phases:

PLACING PHASE:
White starts. Players in turn place ONE of their pawns in any empty square of the board until all the pawns have been placed.

MOVING PHASE:
White starts. Players in turn MUST move ONE of their pawns one square orthogonally to an empty square.

The game ends when one of the players 'dominates' the board by having placed 4 of its pawns on 4 identically colored squares.