--> The Brain Vita game supports two modes: "Standard" - 32 filled cells and "Mini" - 19 filled cells.
--> Three adjacent cells (C1 Filled, C2 Filled, C3 Empty) are required for a valid move in either of the four directions - top, bottom, left and right.
A valid move is triggered by pressing C1, which changes C1 from Filled to Selected and C3 from Empty to Possible target.
Pressing C3 then completes the move, which changes C3 from Possible target to Filled and makes C1 and C2 Empty.
--> The objective is to have only one filled cell left on the board at the end of the game by making valid moves to change filled cells to empty ones.