At the moment, we are (perhaps mistakenly) focused on the multiplayer design of the game, as that is our primary intended niche audience. We don't, however, want to forget about any interest players may have in the game when playing alone. Personally, we feel the cars are a lot of fun to drive even when just playing alone but, yeah, we get that awesome car physics in a funky playground will not always be enough of a solo experience for many. Thus, please stay tuned for leaderboards, AI cars, and who-knows-what else targeted at single-player modes. No idea yet as to when such things may arrive. So, if you want us to hurry up on single-player features, please don't hesitate to shout it out to us so that we may hear it over all the engine revving.