If you value your time and you enjoy your sleep then I'd suggest that you DON'T buy this amazing PSP game. It will grab hold of you and it simply won't allow you to put it down. Time and time again you will find yourself reaching for your PSP for just 'one more' game. Utterly addictive, totally absorbing and great fun to play. It's a lot better than Tetris and the premise is just as simple - Put the falling blocks (each made up of 4 coloured squares) into places where the various colours will make up squares of 4 or even larger squares to make the squares disappear. For Lumines though, not only is the game better than Tetris technically, it sounds much better too and the chance to earn new skins and music as you get better and better makes the game even more enduring. Pick this game up without delay, it's one of the few essential PSP purchases out there.