Sonic Adventure DX

Start a new game. Play as Sonic and go to the Station Square Chao Garden after completing Emerald Coast. Then, go to the Mystic Ruins. Go to the Chao Garden in the Mystic Ruins and get out. Then keep playing his adventure until where you must go to the casino. Instead of going to the casino, go to the Station Square Chao Garden and go to the Mystic Ruins garden by the transporting circle that reads "Mystic Ruins". When you get there, you will see the night sky. Note:This will not work in the S.S. Chao Garden.

When you get to the Perfect Chaos fight, instead of running, jump and hold the Analog-stick in the direction that you want to go. You should turn to the Bolt of Lightning with at least two or three of these jumps.

Charge up before you destroy the capsule. When you jump on top of the capsule you should dash out of the way. Sometime you will destroy the capsule but you will not be on top of it.

Select Sonic and go to Red Mountain. Go to the area with the big spike ball and little air-spout things. A few feet in front of the ball is a geyser. Run around it a little. If you hit the correct location, you will fall through

When you get to the Perfect Chaos fight, go under a waterfall but put Super Sonic on the other side of it. If done correctly, you should see a figure of Shadow (from Sonic Adventure 2).

When running down the wall in Speed Highway, press (and do not hold) B to do a Spin Dash. Sonic will roll and you can pass through obstacles.

Go to the part near the hotel where the cars go in and out. With Tails or Knuckles, go to that part in a ball. You should just roll in place. In a few seconds, the inside part of the body will shrink and disappear. When this happens, in a few seconds you will return to normal. Note: This may not happen anywhere else.

As Sonic, go to the Train Station in Station Square. Do not go in yet, just charge up fully. When the doors open, release B or Y. You should hit a wall that is not there.

Select any character and go to Station Square. Then, go into the train station and go up to the train. Do not get in the train. Next, go as far as you can towards the front of the train. You will notice the train is standing on a track. Press R and if done correctly, you will see that at the end of the tunnel is just sky and clouds, but no track.

With any character, go to the patch of grass on the side of the Speed Highway Building. Rotate the camera with R and you should see water and sky, but nothing else except cars going back and forth.