a city drawn in pencil · tyres made of crayon

Left thumb drives — press anywhere on the left, slide to steer, push up to go and pull back to brake.
That leaves your right thumb for BOOST and SLIDE. GO and STOP still work if you prefer them, and the minimap opens the whole page.

Burst a paint tin and the block comes alive — then keep spreading it off your tyres.
The tidier it looks, the more erasers turn up to rub it out. Squash them.
Ramps go up onto the rooftops. A whole box of crayons is scattered about — find all eight.