Solar Challenge Edition - Well that's new. The name implies this version includes at least the Space DLCs of the game, Mars, Neptune and Space Exploration. But in fact, it's even more than that. They say this version includes 60 tracks in 12 locations plus their respective boss tracks. This means, this doesn't just include some of the DLC. This includes all of it. This is a complete edition of Redout as far as I can tell. If the tide of DLC this game currently has on Steam was keeping you off, this is the version for you. The price is now fair enough even without the current sale. Redout is a fantastic futuristic racer and if you have any sort of interest in the genre, I'd really recommend you to get this game. Once you put a little bit of effort in and learn how to properly take a corner in this game, it's incredibly rewarding and offers a unique flavor of futuristic Racer. This isn't just a Wipeout clone. The physics are an entirely unique beast that is much more momentum based than other titles in the genre. This focus on momentum is only further complimented by several tracks being on other planets or in space altogether. As gravity changes between locations, it's quite challenging getting your mind around where to angle your craft in order to most effectively get where you want to go. The game is great and I keep coming back to it even after I beat it completely. Can't recommend it enough.