Well Half-Life 2 is great and I needed to get Ep. 1 before the orange box. The game starts right where HL2 ended, the core exploded, but you are still in the tower. Most of HL ep1 is figuring out how to stall the explosion of the reactor to allow gordon and alyx passage outside of the city. Much of the gameplay is in the combine tower using the gravity gun (upgraded) and this is fun, but does drag on a little. After most of the game is finished, you start to leave the center of the city looking for a train to exit. After some combine action, you are faced with a stalker as a final 'boss' which is cool.
The game looks pretty much like HL2 with some possible technical improvements which arn't really noticeable. This is not a bad thing though.
There is a lot of puzzle solving with physics which I liked but possibly too much gravity gun. Great continuation though and a good connection between HL2 and ep.2.
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