A clone of the classic Loopz game for the Atari ST computer, Double is a Java applet, written by Martin Koerwien and Michael Kraus, that brings to the browser the same addictive and challenging gameplay.
The object of the game is to place random pieces on the play field to form closed 'loops' which then disappear to make room for more. You may rotate each piece before placing it, much the same as in the game Tetris. Scoring is one point for each tile of the closed loop built. Your points are doubled if you clear the board, hence the name of the game.
Move the mouse to position each piece, click the left mouse button to drop it. Click the right mouse button to rotate the piece before dropping. You may erase one piece from the board for every 100 points you accumulate, but only if the current piece you are holding is the same as the one to be deleted.
Each new piece is delivered rather quickly, and if you don't place the piece by the time another one is ready, the piece will be dropped for you. The game is not easy by any stretch of the imagination, and yet it is quite easy to pick up and get started playing.
A very kind thanks to Seb for sending me the link to this game.