I assume it's the classic, since I've had it since...I dunno..the 80's I guess. I liked the old zoids when they looked mechanical and you could see all the moving parts. Then they tried to go for a sleeker look like everything else, and they ruined it. I'm not even sure I have all the parts, I guess I should try assembling it. I don't have a diagram or anything, I'm just holding the pieces in my hand and guestimating. I might even try to animate it. I assume that if I make all the parts into rigid bodies, then rotate the bits that rotate on the real thing, then it will HAVE to move like the real thing. Which, if I remember right, was a very jerky affair.