Unbrewed Pro

The sandbox lets you play Unmatched any way you like — Pro is the opposite promise: a referee. A server enforces the full rules — legal moves only, automated combat math, properly hidden hands — so you can battle strangers without trusting them, and one day fight an AI. Every fighter's cards must be hand-converted into engine rules, so the roster opens a few heroes at a time.

The free-form sandbox isn't going anywhere — Pro is an additional way to play, not a replacement.