There's only one version, the original MPC kit from 1984. It was snap and had legs designed to not bend at the knees or otherwise move. I built it in 84 and a few times since then. Glue wasn't required but it did make it a better fitting kit.
There was also a "Structors" version that used a windup clock with key. It walked and the twin cannons recoiled as it walked. It was more of a toy to assemble than a model kit