Chao pillow:
Go to a Chao Garden and get a coconut. Then, with a sleeping Chao, pick up the coconut and put it by the its head. The coconut will act as a pillow.
Clone a Chao
You will need 2 memory cards with at least 128 blocks on each. First take the chao you want to clone out on one of the VMUs. The either e-mail yourself a copy (or to a friend) or just copy in the file manager of the dreamcast. The File is Sonic2____VM. Now you have two of the same chao.
Dark Garden for Chao
Take a Chao and raise it with a Dark character. Feed and train it until it cocoons. After it evolves, stairs will appear at the Chao Lobby. Follow them to reach the Dark Garden.
Dupe Chao Warning
For extra Chao, you can put a Chao Egg from SA1 on a memory card and take it out in SA2, but if use use any type of egg besides regular, it might screw up (my Chao became all distorted). Also, it will be a regular caho, not silver, gold, or whatever type of egg you used.
Full pause screen
Pause game play then press X + Y.
Hero Garden for Chao
Take a Chao and raise it with a Hero so that it will resemble a Hero. Win a Hero Fruit in the VMU game, then feed it to the Chao. Wait until it cocoons into an angel-like Chao (it will have a halo). Then, take the stairs going up at the Chao Lobby to reach the Hero Garden.
Hero or Dark Chao
To make a Chao a Hero, simply use a Hero character and keep pressing B or X to pet them. If done long enough, it will go white and be a Hero. To make it Dark, just use a Dark character and do the same thing.
Hidden artwork
Put the game disc in a PC compatible CD-ROM drive to find additional images from the game.
Knuckles Lost Chao
Pumpkin Hill: Use the mystice melody, follow the path.
Play Catch with S.W.A.T. BOTs
First, you must have the Magic Hands for Sonic. You find them in the "City Escape" level by using the Fire Ring and Bounce attack on four metal boxes.If or when you do, go to the level, "City Escape," then find a S.W.A.T. BOT. Press the Y button until it says "Magic Hands" in the top-right corner, then press B. When you do, the S.W.A.T. BOT will explode and then appear inside of a little clear ball. Pick the ball up and find another S.W.A.T. BOT. Once you do, throw the balled up S.W.A.T. BOT at it. The S.W.A.T. BOT should shoot the ball and the ball will be sent back to you. After 6 or 7 throws, the balled up S.W.A.T. BOT should blow up and die.
Pumpkin head for Chao
Find one of the Skeleton Dogs; the easiest place to do so is Pumpkin Hill as Knuckles, and combine it with your Chao. As either Knuckles or Rouge, start digging around in the Chao Garden. Eventually a pumpkin will appear. If you give it to the Chao mixed with the Skeleton Dog it will put it on its head. If you want to take it off, either throw or hit your Chao.
You can find pumpkins in the regular and Hero Gardens, and skulls in the dark Garden. Get them by digging as Knuckles or Rouge.
Run on foot
At the start of the City Escape level, instead of landing on the ground with the board, scrape the roads on the board. When on foot run full speed at a wall and get knocked down. Pause game play if you fall after hitting the wall. Choose to restart the level to run on foot and not on the board.
Tip: Planting Seeds in the Chao Garden
If you play through the Chao Adventure 2, the VMU game, you will find seeds at the end of some of the quests. These seeds can be taken to the Chao garden and produce rare fruits. In order to plant these seeds, you need to first win the shovel and watering can in the beginner Chao races. As soon as you have won these, take the seed out of the VMU and give it to one of your Chao. The Chao will take it, plant it, do a little dance and a little weed you appear. Eventually, it will grow into a tree that you can use to help improve your Chao stats.
Unlock Last Stage
In order to play the actual last stage of Sonic Adventure 2, finish both Hero and Dark side story games. Once done, go into story mode and a "Last Stage?" menu selection should appear between Hero and Dark selections.
Wake a sleeping Chao
Sleeping Chao are annoying because you cannot feed them. To wake them up, stand next to it and whistle. You do not have to anger them by picking them up during a little nap.