Chao Adventure is a mini-game that can be played on the VMU in Sonic Adventure 2 for the Dreamcast. This game is designed to train the player's Chao to become faster and stronger, and it appears when the player transfers a Chao from the Chao Garden in Sonic Adventure 2 to the VMU using the Chao Transporter.
When Sonic Adventure 2: Battle was released on the GameCube, Chao Adventure 2 was replaced with connectivity to the Tiny Chao Garden in Sonic Advance, Sonic Advance 2 and Sonic Pinball Party. The equivalent mini-game for Sonic Adventure is Chao Adventure.
This mini-game is filled with training, which will build up a Chao's speed and strength, so it can then be used to earn Emblems in Sonic Adventure 2. This game is very similar to Chao Adventure, but contains more activities, such as a Chao battle mode. Like the first game, this one still has collectible items and Chao can still be bred by connecting two VMU units together.