2 Games in 1: Sonic Advance & ChuChu Rocket!
From Sonic Retro
2 Games in 1: Sonic Advance & ChuChu Rocket!, called Double Pack: Sonic Advance & ChuChu Rocket! (ダブルパック ソニックアドバンス＆チューチューロケット！) in Japan, is a compilation of two games for the Gameboy Advance. It contains the games Sonic Advance and ChuChu Rocket!. There are no extras, just a menu that lets you select the two games.
The in-cartridge cheats and unlockables for the these games still work, however the game enhancer codes do not. The respective cheat page for Sonic Advance can be found here: Cheat Codes:Sonic Advance.