Doom 3 BFG edition, took just over 9 hours. Pretty big game, gets much better half-way through since it stops spawning soldiers and focuses more on the cool monsters. Plus by that stage you are mostly using Plama Rilfe + Rocket Launcher which are really fun weapons.

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I started the expansion, Resurrection of Evil and so far so good. Only monsters! But I have 3 essays to complete so might not be able to dig into it.