This is a little confusing to master at first and it means that players are going to need to keep careful track of their dice and exactly what numbers they get on their rolls. It also means you might need a lot of d6's. The stat and skill systems are exceptional. Orkworld's stat system is one of the few where the stats truly are a reflection of the game itself. You don't have any of your generic intelligence, strength, dexterity, etc.
Level is handled differently too.
An ork's level is called his zhoosha and it is not a static, abstract number. Instead, it is a real number that is used to directly affect die rolls and actions in the game. The skill system is unique in that there isn't a set skill list. Instead of hitting the reader up with some arbitrary listing of skills, the players are allowed to make up their own. This results in characters all having unique abilities based directly on just what they want their thraka to be good at.