The Poly Track community is highly active, with thousands of maps ranging from technical drift circuits to impossible stunt tracks. PolyTrack community - itch.io
Once the track appears, you can test it immediately or save it to your local library for future speedruns. Where to Find the Best Track Codes
The process of adding a new community-created level to your game is straightforward:
Navigate to the Level Editor or click the Import button usually found in the top right of the main menu.