The idea is a robot supporting a crate or being one. The robot can look like a 
truck or a forklifts. Just a cube is possible, with wheels and head. This bot 
can be used in quest to transport materials. Don't attack, but can transport 
explosives.

Many colors in function of the goal :
Green: Bots used in quest.
Blue: Regular bots.
Orange: Explosive bots.
Golden: Rare bots which give a lot of loots.