The game proposes you unlocking after four tracks (+ tutorial), when you tap on SEQUOIA NATIONAL PARK.
That doesn't seem possible but I'll give it another try. This game felt like a racer from no later than 1990. Reminded me of rad racer.
That's the whole design idea of the game, it's very retro. It's no Outrun, but it is close. Asphalt is all bells and whistles with the Fast and Furious inspired big jumps and stunts.
Asphalt is definitely more than bells and whistles. The gameplay is outstanding. Tilt controls along with the drifting make it more fun than any racer I've played with a controller. Anyway, I'll stop now.