Secret Chao Eggs
The main difference between Sonic Adventure / DX and Sonic Adventure 2 / Battle is that the former has three adventure fields that you can freely walk around in between action stages. This is how we will come to find some secret Chao eggs!
As you know, you can find Chao eggs in the various gardens which are white, with blue spots and a yellow cap. However, there are some rare Chao eggs located in the different adventure fields for you to find, and take back to the Chao Garden!
You can only find one of each egg per save file! If you have already taken the Gold egg, for example, then you won’t be able to get another one on that save file.
Station Square hides a Gold Chao Egg! Go to the area in Station Square where Sonic first fought Chaos 0. There is an Antique Shop nearby. If you look through the window, you can see a shiny stone on display on a pedestal. This is the Gold Chao Egg! However, if you walk inside and try to pick it up, you will see that it is not so easy to take. When you pick up the egg, the shop’s alarms go off and you get locked inside! To take the egg, you will need to leave the shop and move to the enclosed area by the town hall. There is an egg-shaped rock hidden in a grassy corner of this enclosure. Pick up the rock and take it back to the antique shop. Then, simply replace the Gold Egg with the stone on the pedastal; this will trick the shop’s alarm! You can then carry the Gold Egg back to a Chao Garden.
The Mystic Ruins hides a Silver Chao Egg! Go to the small lake opposite Tails’ house in the Mystic Ruins (where you fought Chaos 4). You will see a waterfall, and if look closely, the Silver Egg is there behind it! However, it is locked into place by some strange mechanism. To release the egg, you need to move over to the right side of the lake at water level. There is a large button built into the wall, which looks like a small platform. Walk into the btton and it will move into the cliff. This will cause the Silver Egg to be pushed out of the side of the cliff to land safely into the water below. Now all you have to do is wait for it to float to the shore of the lake for you to pick it up and take it to the Chao Garden.
The Egg Carrier hides a Black Chao Egg! This egg can only be found by Amy or E-102 Gamma. Inside the Egg Carrier, head to the prison cells where Amy was being held captive during her adventure. If playing as Amy, go into the main section of the Egg Carrier and go to where you play the mallet game (the door next to the Hot Shelter). Walk through here and it will take you to the prison cell area. Jump on the button ouside the cell to open the door to allow you to collect the egg!
The Dreamcast version of the game will give you a spotted black and red Chao egg, containing a Two-tone Black Chao. The DX version will have a Mono-tone Black egg and Chao.