This is probably a terrible theme suggestion, but how about one where only flat blocks and straight sloped blocks are allowed. No flat-to-sloped blocks, no platform ramps, no curved turns, etc.
i like fredajr's suggestion. but i'd even say the driving route should be limited to maximum 4 blocks wide (scenery excluded, so you can still build scenery around the map)
spX Seven says: i like fredajr's suggestion. but i'd even say the driving route should be limited to maximum 4 blocks wide (scenery excluded, so you can still build scenery around the map)
The problem is, how to check if the scenery is really a scenery? I mean, some people could use the scenery as a driveable block and say "no no, it's a part of the scenery". At least with the "Quantum hourglass" theme we hadn't this kind of discussion