I love puzzle games. My all-time favorites are Portal 1 and 2, but I also really enjoyed Infinifactory, SpaceChem and Opus Magnum. All of these latter ones are games where you're constructing a machine to assemble parts in a specific pattern. I love the spatial reasoning they require.
I also love the rollercoaster tycoon games, and if I ever get to the point where I can reasonably afford to get a gaming PC, I want to get planet coaster.
I also recently dusted off my old generation XBOX, and I've been playing a lot of Tony Hawk's Underground 2, Worms Mayham, and XIII (It's one of the only shooters I'm good at, because the bright colors and big contrasts often make enemies easy to spot.
Try Q.U.B.E if you haven't played it yet. It has a portal feel. I think it Epic was giving it for free a few days ago.
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