I'm not a fan of first-person shooters - I get bored with just killing targets too quickly, and the rapid movements necessary invariably make me  nauseous. Half-Life is different: It makes me think, it has a mystery-laden  storyline and it looks marvellous. The visuals, sounds and effects are  bloody perfect. Not only that, the opponents are very crafty - I was  surprised to see one beast actually duck behind cover when I shot at it!