Gudamusai turns out to be (big surprise)
a microplayset. It features spring missiles and a nose-launching micro Gunbike. Catalog shot of
Kiba Oh Maru -- no gimmicks described, but he's gotta do something.
In seeing Japanese listings for Hyper Captain Gundam, I assumed it was the gold version found in US stores. Catalog pictures
show an entirely new design, giving him GP-01 features.