Don't ask what happened to the first Crystal Mines, but this is the sequel. It's a very old format in which you have to collect crystals, zap the odd nasty and avoid getting crushed by boulders. Oh, and there's a time limit, too.

The scrolling in this game's wicked. It moves extremely fast leading to accidents with on-coming rock monsters. The temptation is to zoom around the muddy levels, zapping at anything that gets in your path. Do this, however, and rocks drop on you, boulders explode and you die. Repeatedly. There are loads of power-ups to ease your task over the 100 levels including power tools, strong lasers, bombs and cash.

Crystal Mines 2 is a devious little game whose addictive qualities creep up on you gradually. Great sound, swift graphics and loads of levels mean it's likely to outlast the rainy weekend you bought it for.

Type in the level code 0000 for a treasure trove of goodies, power-ups and an huge end-of-level bonus.