Unlock Characters for Kaos Mode
To unlock characters in Kaos Mode, finish these challenges:

Spanky: Complete the Mall in Revolution Mode
Freak: Complete Chinatown in Revolution Mode
Bull: Complete East Side in Revolution Mode

Unlock Unlimited Time in Kaos Mode
To get unlimited time, beat Arcade Mode in all Kaos maps.

Unlock Maps in Kaos Mode
To unlock the following maps in Kaos mode, complete the challenges listed:

Chinatown: Get 25,000 points in Kaos Mode in Capitol City Mall
East Side: Get 50,000 points in Kaos Mode in Chinatown
Corporation Central: Get 100,000 points in Kaos Mode in East Side