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Well, for starters, Carnage needs Venom to be set up. Secondly, that's not true. Carnage shows up in plenty of video games, like Shattered Dimensions, PS1 Spidey, Friend or Foe, and other games. To say nothing of the fact that he was the final boss of Amazing Spider-Man 2's game.
You want to talk about villains who don't show up in games? When was the last time you saw Roderick Kingsley as Hobgoblin in a game? Or how about Hydro Man?