Object: The object of the game is to move the four rings from the column on the left to the column on the right, in their original order -- red, green, yellow and blue. The trick is that you may not place a ring above a ring that has precedence -- for example, the red ring may be placed on top of any ring, but no other ring may be placed over it. Any ring can be moved onto an empty column. When you move a ring from one column to another, it will move to the furthest position down that column that it can. You may only move the topmost ring from any column.

To move a ring, click on the gray diamond beneath the column. The diamond will turn the color of the ring that is to be moved. Click on the gray diamond beneath the column you want to move the ring to -- if the move is valid, the ring will be moved to that column, otherwise you will be notified of the invalid move with a large red "X".