Board Thread:Game Discussion/@comment-26338036-20151201012559/@comment-26338036-20151201110729

It takes you back to challenge 1. The drawback I see here when not attempting to keep the high numbered challenges is the total points earned for each challenge. You earn more points per challenge (per boss) at high numbered challenges than in the earlier ones, making you reach your goal faster. So we must be very very carefull when driving to follow the objectives as strict as possible.

Also when restarting, apparently you need to spend a ticket for that (I'm currently #25 first attempt, waiting for car services).