One of Mitsumete Knight R : Daibouken Hen 's anime CGs, on Playstation 1.
So the heroes, in order to cross the river that stands between them and the item they need to find, jump into an ancient mecha hidden in the Pyramids...
That game is really bizarre... Humogous mecha and flying machines in an heroic-fantasy setting ? In TV Tropes I think it's called "Ninja Pirate Zombie Robot". :p
Oh, and the shout out to Tetsujin 28-go (known as Gigantor in the US) is really blatant.
Appears on these pages
The following is a collection of videos featuring the game Mitsumete Knight R Daibouken hen.