Similar to other "2 in 1" Game Boy Advance releases, "2 in 1 - Shrek 2 & Madagascar Operation Penguin (E)(Independent)" bundles two separate game experiences onto a single cartridge. Each title, originally released independently, likely draws on its respective movie, "Shrek 2" and "Madagascar: Operation Penguin". The gameplay would vary between the two games, but each is probably tailored to the movie's themes. Given the "Independent" label, the compilation was likely produced by a smaller studio or publisher focusing on movie tie-in titles for the GBA handheld. The popularity of the DreamWorks franchises served as the catalyst for the games' development. 

2 in 1 - Shrek 2 & Madagascar Operation Penguin (E)(Independent)

2 in 1 - Scooby-Doo & Scooby-Doo 2 (E)(Independent)