Help Bristlies to get into boxes of the same color. Cut ropes and use interactive objects to solve the puzzles. If you get stuck, just restart a level several times and skip level button will appear.
Click on a rope to cut it. Use "R" to restart level.
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.