- Select the A-Rank Rooted challenge and set it to lvl 12 (it is a bit buggy so you got to hover your mouse on the challenge, set it to 12 and then click on it)
- Go as far as you can, it's hard, but the best way is to stop after Zone 1 or 2, i just tried to go as far as i could. If you "just" need some millions stop after some stages.