I own both and I would say they're worth the twenty, quite long games and a lot of fun. As to haggling, he sounds ok with it, I wouldn't try to go any lower though, and if you feel bad just go with the twenty.
I also haven't seen any hate on the game for being too similar to the first. I've seen hate on it for charging 60 on the pc and the nuke and other changes but not for its similarities
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