If you’re having issues with the demo try using a Chromium based browser
Controls
right click + wasd – move the camera
numbers – select map piece to place
1 – straight
2 – turn
3 – ramp
4 – start
6 – finish
E – create map piece
arrow keys – move map piece
r – rotate map pieces
u – move map piece up
i – move map piece down
enter – confirm map piece position
left click – select already placed map piece
place start and finish before testing
t – test mode (drive a car)
wasd – drive car
left shift – drift
enter – return to create mode