Hamtaro Rainbow Rescue is a Game Boy Advance game published by Rising Sun from the Hamtaro franchise. This game likely focuses on a rescue or adventure narrative involving the Ham-Ham gang. Gameplay would probably involve navigating environments, solving puzzles, or engaging in challenges to complete the rescue mission, utilizing the charming aesthetics of the Hamtaro series. 

Hamtaro - Rainbow Rescue (E)(Rising Sun)

Hamtaro - Ham-Ham Games (E)(Rising Sun)