Robocraft is a game where you build vehicles to fight other player-built vehicles and then you get into online matches and stuff. They describe it as World of Tanks meets Minecraft, which isn't far off, at least on the World of Tanks resemblance.
It's free on Steam so check it out: http://store.steampowered.com/app/301520/
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If it's a Core i7 it's probably got the graphics integrated in the CPU. It's not going to run games very well.