Here is an effective puzzle game to test or wake up your neurons numb by holiday or stress.
Take away a specified number of matches to form a specified number of squares. All the squares are counted and each match must be part of the square.
Click on a match to remove it. Be careful, you cannot undo your moves.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.