You are trying to fill the board with red. The computer is trying to stop you, and it is blue. When you mouse over the board while the computer is not thinking, a red tile will follow your mouse. Press SPACE to place the tile when you are above a green tile (You may not place a tile when you are over a blue or red tile). Any tiles by the edges of your tile will turn red. The same goes for the computer when it plays. You may choose the number of randomly placed tiles on the board, this is how much luck is involved (0 starting tiles = all skill), (106 starting tiles = all luck). Make sure you press the green flag after you select the number.
Please report any bugs (I'm making soup).