Lots of mini-games in a cute world filled with talking hamsters, each with their own specialities.
Prince Bo fell off his rainbow and he needs help to return to Rainbow Land. Cue Hamtaro and his friends, who have to gather the seven colors of the rainbow to rebuild it. By winning the mini-games you earn stickers and pictures which can be used to fill a virtual stickerbook but can also be traded with friends with a GameBoy Link Cable.
- "とっとこハム太郎４・にじいろ大行進でちゅ" -- Japanese spelling
- "哈姆太郎：彩虹救援大作戰" -- Chinese spelling (traditional)
- "Tottoko Hamutarou 4: Nijiiro Daikōshin dechu" -- Japanese title
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This entry to the MobyGames database was contributed by PolloDiablo (16322)
on May 18, 2006.