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2 Games in 1: Sonic Battle & ChuChu Rocket! is a video game compilation of two Sega titles, one of which is from the Sonic the Hedgehog series. It was developed by Sonic Team and released for the Game Boy Advance in 2005 by THQ in Europe.
The games in 2 Games in 1: Sonic Battle & ChuChu Rocket! themselves are nearly identical to those that were originally released. However, the game is given a selection menu for the different titles it contains. When booting up 2 Games in 1: Sonic Battle & ChuChu Rocket!, the game's selection menu is displayed. The control of the selection menu is done with : by pressing up or down, the player can select the different games.
Depending on the game loaded, they will each have different results when the player resets the game (by holding + + Select + Start), regardless of the Game Pak each game is being played on.
If Sonic Battle is loaded, the player will get kicked back to the game's title screen.
: by pressing up or down, the player can select the different games.
+ 
+ Select + Start), regardless of the Game Pak each game is being played on.