Yeah you can totally get into the wrong area and even stumble onto a boss battle before you technically unlock it.
Best I can tell is you start at the bottom left and go sort of clockwise around the map.
There's a healing grenade you can throw and get a bunch of health back. That is useful later on when the bosses get tougher.
Best I can tell is you start at the bottom left and go sort of clockwise around the map.
There's a healing grenade you can throw and get a bunch of health back. That is useful later on when the bosses get tougher.