Last Stage
If you complete both the hero and the dark stories to reveal the "last story"
which involves super Sonic and a new hyper form. ;)
New Kart Music
If you collect 69 Sonic Emblems, the background music for the kart racing
game will change.
Hidden 3D Green Hill Zone
If you collect all 180 Sonic Emblems, you will be able to view a new millennium version of the first Sonic stage: Green Hill Zone.
Secret Kart racing characters
Amy-Beat all of Sonic's levels with an 'A' ranking.
Tikal-Beat all of Knuckle's levels with an 'A' ranking.
Mecha (Metal) Sonic-Beat all of Shadow's levels with an 'A' ranking.
Help with timed levels
On some of the treasure hunting levels, you are timed to see how fast it
will take you to get an emerald. If you just can't seem to find a certain
emerald, purposely die. It should restart you on the level with all the
emerald pieces you had obtained before.
Beating Big Foot/Flying Dog
If you notice on the big foot/flying dog levels there are wooden crates.
Before big foot/flying dog destroys them, jump on a crate that it's heading
straight at and home in on it. If you jump high enough, the machine will be
injured, if not, it will be vice versa.
Defeating Sonic/Shadow
In the beginning, use your homing attack on either Sonic or Shadow. This
will prove most effective. When the health meter is getting rather low, use
the light speed dash when Sonic/Shadow is warping back onto the track. It
should propel you straight into him. Note: The rings must be right in the
middle of the track and Sonic/Shadow must be reappearing right in the ring
path.
Big the Cat cut scene appearances
At the beginning, keep pressing the "A" button during the scene where Sonic
jumps out of the plane. Big will stick his head out of the helicopter.
Invisible board
On the Metal Harbor level (Hero) press the "Y" button on controller B. Sonic
will glide down the pipe with an invisible board!
"Easy" A Ranking
If you get every single ring on any stage, you will receive a 'perfect'
rating for Ring Count which most likely to give you an A ranking. A very
hard to do code
Total Pause
Pause your game and hold down the 'X' and 'Y' buttons to clear the pause
menu. *Note:This only works on controller 1
Sonic Artwork
There is a collection of Sonic wallpapers and other things in the Sonic
Adventure 2 game disk. Just insert it into your computer and it should pop
up in a new folder
Multiple Chao Gardens
If you raise one of your Chao to be a hero Chao, the Hero Chao Garden will
be unlocked. If you raise a Dark Chao you will get a Dark Chao Garden. Kinda
common sense...
New Looks
If you beat every single mission for all of the characters the look will
change in the 2 player VS mode.
Play As A Chao
If you successfully beat all of Tails' levels with an 'A' ranking you will
be able to play as a Chao in 2 player VS
Chao Items
Chao Radio - Complete the 'Angel vs Devil' race. You should receive a radio
for your Chao. This is only for the Dark Garden
Chao TV - Win the 12th race in the Challenge Races. You should receive a
television for your Chao in the normal Chao Garden
Chao Jack-in-the-box - Win the Pumpkin Group race. You should receive a
jack-in-the-box for your Chao
Chao Ball - Win 2nd place in the Hero Race to receive a Chao Ball for your
Chao in the Hero Garden
Fetching Chao
If you whistle while in the Chao garden, the Chao will get a question mark
on his head, look for you and then run towards you
Faster Chao Hatching
If you throw a Chao Egg it will make the Chao inside hatch much quicker
Kart Racing
To unlock the Kart Racing mini-game complete either Route 101 or route 280
with Tails or Rouge. To unlock the multiplayer version, beat both routes.
Easy Emblems
In your VMU make a new file with previously saved Chao Garden data. This
data must have all the races completed! Enter the Garden and go to the race
entrance. Choose the Crab Pool Beginner Race at level 3. If you win this
race, you will be awarded with five emblems. Next, enter the Diamond Jewel
Race level 5. Winning this gives you 5 more emblems.
Super Sonic and Hyper Shadow
If you clear the cannon's core stage and defeat The Biolizard: The Prototype
of the Ultimate Life you will be sent to a boss stage in which you play as
Super Sonic and Hyper Shadow as a tag team to save the earth. Live and Learn
plays in the background. ;)
Knuckles and Rouge: Extra Lives
When playing as Knuckles or Rouge in a treasure hunting level (most of them
are treasure hunting, with a few exceptions), dig constantly in different
areas. You should get ring power ups sometimes, and even extra lives. In two
player VS, this can be used to gain power for special attacks.
Sonic and Shadow: Extra Lives
When in the final boss scene on either side, use the light dash to collect
as many rings as you can. This is a great way to gain many lives.
SA2 City Escape Demo: Run on foot
In the beginning of the City Escape level, instead of landing normally on
the ground with the board, scrape the roads on the board. Once you get on
foot, run at top speed at any wall and get knocked down. Pause the game
after falling and restart the level. You should run on foot instead of the
board.