One of 14 great puzzles. Slide the pieces into the blank square to make the picture, as fast as possible. Download now!

Long a favorite children's puzzle, this is the classic "missing square" puzzle. There are 15 pieces in a 4x4 grid, with one piece missing. By sliding the other pieces into the missing square, you need to put the puzzle in order. When you have the correct answer, it will reveal a stunning picture.

TLS Brain Training has 25 different pictures to try - and the puzzles come in three different sizes from easy (3x3) to hard (5x5).

Other Puzzles in TLS Brain Training