The objective, as we all know by now, is simple: rotate and move the falling pieces to align three or more in any direction: horizontally, vertically, or diagonally. When three or more pieces line up, they will 'explode' and disappear. If there are any blocks above the exploding blocks, they will fall into the old blocks' places. If these pieces that fall into the newly vacant spots create explosions of their own, a 'chain reaction' occurs and bonus points are awarded. As each level is reached, the pieces will fall a little faster, making the game much more challenging.

Its similarities to Tetris notwithstanding, Chain Reaction is a lot of fun and very addicting. The game looks great, plays great, and even sounds good. Best of all, given the option to randomize them, the number of levels is virtually infinite. Great 'plasma' animations and an incredible soundtrack by Webfoot musician Ariel Gross round off this fun underdog you'll spend a lot more time on than you'd care to admit ;) Highly recommended!