At first, it certainly looks like a basic Tetris game, with the same basic shaped blocks falling, and you can move and rotate them on the way down. However, after a few shapes, you quickly realise there's some differences here -- firstly, full rows don't count for anything... you just keep building. And second... physics! As you build your tower higher and higher, it starts to get less and less stable, and it starts to sway. You need to be careful to fill in gaps, and not put pieces in dangerous positions, in case they fall and take part of your tower with them.

Oh yes, and the title comes from the fact that you only have 99 bricks with which to build your tower. Mustn't forget that!

I can't say I found it addictive as such, but I think the concept is great. Graphics are really good, the controls/response are slick, and the physics is well implemented. The music is not wonderful, but it's not bad either. All things considered, it's well worth a try.