Portal is a lot of fun! I haven't finished it yet, but STALKER is very enjoyable too. It's more of an RPG/FPS hybrid, but the FPS aspect of it is pretty challenging (IMO) because you have to employ some serious tactics instead of just running in and shooting everything. Getting shot in STALKER is bad news because it impacts your ability to move (and aim) instead of just being blips on a health bar. You also don't regenerate health, and first aid kits are hard to find and expensive if you need to buy them.
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