If you want a challenge after xcom EU
I have the Windows Collector's Edition (CE) version on CD-ROM so I never bought it here.
Some of the down sides are the larger maps, which at first sound good, however it tends to make ending missions tedious as you are hunting down this one last alien who has panicked and dropped his weapon. You spend at least half the time it takes to complete a mission just looking for the last alien who is often literally hiding in a closet, then when you do find him he doesn't even resist when you kill or capture him.
Another thing are some near-game breaking bugs in the research tree. They aren't technically game breaking, but they make the game 10 times harder if you can't research proper armor because you didn't get a chance to capture a calcenite or deep one. If you get the game, grab a live Calcenite and Deep One ASAP, and make sure to read an FAQ on the proper research order for them. Seriously, capture them at all costs ASAP as you might not get a second opportunity.
If you capture one in part one of a potentially 2-part mission, make sure to pick them up in your inventory so you have the capture after the second part, and capture another one if you get a chance on that mission. '
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