Kyobi is a Columns-style stack-em-up with a physics twist. Your job is still to match 3 or more of the same colour, but once the blocks land they are not stuck down - any square can be grabbed and thrown around the playarea. All the surrounding blocks will react when collided with and launch themselves around too.

It all adds up to an incredibly simply, incredibly fun little arcade mode which is very addictive. It is quite noticeable that once the container begins to fill rather high, simply throwing random blocks around will usually result in the majority finding 2 other partners and your workload decreasing rapidly. While this might sound like a cheap way to win, it actually adds to the frantic pace and looks brilliant.

Give Kyobi a try. There's also a postmortem by creator Richard Davey.