>>714162706
It's mostly applying the 'ground' property trait to quadblocks with the 'wall' property but some new code has been worked to allow you to go upside-down without the game trying to reset or break you.

In other news; porting of tracks from other similar games is relatively easy.
All Lego Racer tracks have been successfully ported, several from Speed Freaks and some original creations based off of other IPs have been coming about too.