Crash Nitro Kart (Adventure Mode) - Terra Relic Challenges

Basically the gist of these is crash into numbered boxes to pause time and try to get as low a time as possible. If you get all the crates you get a time decrease bonus.
I like using Coco (and will be using N. Gin for the Team Cortex side) for CNK and Relic challenges because of her good handling making them a bit easier.