Basics: This is probably the biggest Zoid model that you can build. It comes in a huge box, all the pieces are huge, and the instruction book is pretty thick. It also comes with 8 little men. The Gravity Cannon sadly does not come with the Ultrasaurus, since this model is like the one the ZBC has (four big guns on the sides). There a bunch of little guns that you can stick on its body and it has various compartments on its body (back, chest, tail) that you can put stuff in. The Ultrasaurus requires two C-size batteries to operate.

Neat Features: The Ultrasaurus can walk (very slowly), move its neck, open and close its mouth, move its tail, and move the guns up and down. Also, the eyes glow red.

Difficulty: 8/10. The hardest part is the neck, since it's difficult to attach to the body without messing up. It took me a few goes to get it right. The body is also difficult to put together, and it requires you to apply a lot of pressure to snap it together. The huge size of the Ultrasaurus also makes it quite difficult.

Problems: Since there is no cover for the batteries, you might want to tape them in because they fall out easily.

Overall: The Ultrasaurus is a very good Zoid to have because it's really cool. It costs a lot though, so if you don't want to spend a lot of money on one Zoid then don't get it. If you do get it, be prepared to spend a few good hours building it because it takes a long time to put together. Just to warn you, your hands will hurt after you build it.