Yep, that again.

Axel, Grasshopper, Hammerhead, Minion, Mr Grimm, Mr Slam, Outlaw II, Roadkill, Shadow, Spectre, Sweet Tooth, Thumper, Twister and Warthog.

Order of difficulty (Easy -> Hard) : Minion, Spectre, Thumper, Shadow, Warthog, Outlaw II, Mr Grimm, Axel, Mr Slam, Roadkill, Hammerhead.