Edit: Trackmania 2: Stadium is available for pre-order, and you can play the beta if you do so. All the Maniaplanet games are now on Steam, too. Oh, and Stadium looks fucking amazing.
If you haven't played Trackmania, you're missing out. Hell, you have no reason not to play it, since Trackmania Nations Forever is FREE. And Trackmania 2 is looking to be even better.
Trackmania is all about simple, arcade racing that revolving around getting the best times possible on tracks. And that's only half of it. The deep, intuitive track editor from the original is returning, with improvements, and it's possible to make even more amazing tracks than ever before.
Oh, yeah, and did I mention the visuals are jaw-droppingly gorgeous?
Map Editor Video
Just take a look at the map editor vid in the link above - when the guy is finished with the whole thing, the final playthrough of the user-created level looks like something you wouldn't have known was made in a grid-based level editor instead of being modelled by hand or something. Bloody amazing. And there's even a scripting language to allow even more custom content.
So far, it's just the Canyon environment, but the developers are gonna release more environments over time 'episodically'. They're also working on ShootMania and QuestMania, an FPS and an RPG with the same design philosophy as Trackmania 2 - arcade-style gameplay with user-designed levels and content. I'm looking forward to the both of these as well.
Edited by Masaru Daimon, 28 February 2013 - 02:04 PM.