This is a fun underwater version of the game called 'Screw the nut'! Roll the nut to the bolt, so that you can screw it onto the bolt. By clicking on the blue squares or rectangles you can drop the nut in such a way that it will land on the right spot. It's impossible to delete wooden balks. You can use octopuses as trampolines. Try to complete all 21 levels!
Use the mouse to play this mind and skill game.