How to unlock the cards in the game.

Amy in the City Win a Ring Battle without hurting Rival
Amy Rose Get the High Score in Zone 3 Act 1

Beat Get the High Score in the Zone 4 Boss
Big and Froggy Win a match of Capture the Chao without losing a single Chao
Blaze the Cat Get the High Score in Zone 5 Act 1
Blue Falcon Get an S Ranking in Zone 1 Act 2
Blue Ma Djinn Get an S Ranking in Zone 2 Act 3
Blue World Ring Successfully copy every Rival's Signature Moves with Metal Sonicdsw
Bronze Medal Counter 5 Attacks
Buzz Bomber Win 20 Spin Dash Starts

Capsule Successfully Speed Boost 100 times
Chao (Dark: Power) Find all Chao in Zone 1 Act 1
Chao (Dark: Run) Get an S Ranking in King of the Hill
Chao (Normal: Fly) Get an S Ranking in Capture the Chao
Chao (Normal: Power) Get an S Ranking in Ring Battle
Chao (Normal: Run) Get an S Ranking in Tag

Dragonfly Get the High Score in Zone 3 Act 3

E1000 Get the High Score in the Zone 5 Boss
Egg Bull Get an S Ranking in Zone 6 Act 2
Egg Cannon Get an S Ranking in Zone 3 Boss
Egg Cerberus Get an S Ranking in Zone 4 Act 2
Egg Chao Find all Chao in Zone 1 Act 3
Egg Dealer Get an S Ranking in Zone 1 Boss
Egg Guardian Get an S Ranking in Zone 4 Act 1
Egg Gunner Get an S Ranking in Zone 3 Act 3
Egg Keeper Get the High Score in Zone 5 Act 3
Egg Pawn Get an S Ranking in Zone 5 Act 1
Egg Pawn (Casino version) Win Shadow Cup in Single Player
Egg Rounder Get an S Ranking in Zone 3 Act 2
Egg Wyvern Get an S Ranking in Zone 4 Act 3

Gohla Get the High Score in Zone 4 Act 3
Green Ma Djinn Get an S Ranking in Zone 2 Act 1
Guardon Crab Get an S Ranking in Zone 5 Act 2
Gun Hunter Get the High Score in Zone 6 Boss

Hint Box Successfully use 10 Power Ups

Ifrit Get an S Ranking in Zone 5 Boss
Item Box Successfully Air Boost 25 times
Item Box Attack any Rival 250 times
Item Box Attack any Rival 100 times

Jack Bommer Win Silver Cup in Single Player

Knuckles Attack any Rival 50 times with Knuckles
Knuckles and Master Emerald Attack your Rival 8 times in a Race
Knuckles the Echidna Get the High Score in Zone 6 Act 1

Mephiles Get an S Ranking in Knock Out
Metal Sonic Use Shadow's Chaos Control 20 times
Miles "Tails" Prower Win 20 Single Events
Moto Bug Stay in 1st place and win

Nebula Get the High Score in Zone 1 Act 3
Newton Smash 100 containers

Omochao Defeat the Ifrit with Silver

Penguinator Get the High Score in Zone 2 Act 3
Pointdexter Get the High Score in the Zone 2 Boss
Princess Elise Get the High Score in Zone 1 Act 1

Red Ma Djinn Get an S Ranking in Zone 2 Act 2
Rexon Get the High Score in the Zone 1 Boss
Ring Collect 1000 Rings
Rouge the Bat Get the High Score in Zone 4 Act 1

Shadow Beat Sonic 20 times in any mode while using Shadow
Shadow the Hedgehog (Bike) Get an S Ranking in Zone 6 Boss
Silver Medal Counter 10 Attacks
Soleanna Get the High Score in Zone 2 Act 1
Sonic (Soccer) Collect 250 Rings
Sonic (Swimming) Collect 5000 Rings
Sonic (Xmas) Attack any Rival 25 times
Sonic (Xmas) Win King of the Hill with at least twice as many points as your rival
Sonic (Xmas) Win Tag without being tagged
Sonic on the Beach Finish a Battle with 500 Rings
Sonic the Hedgehog Destroy 10 Badniks
Sonic the Hedgehog Destroy 30 Badniks
Sonic the Hedgehog Destroy 20 Badniks
Sonic the Hedgehog 2 Defeat the Ifrit with Shadow
Sonic with Ring Use 100 Boost Panels successfully
Sonic with Ring Use 10 Boost Panels successfully
Sonic with Ring Use 50 Boost Panels successfully
Spring Successfully Speed Boost 25 times
Spring Successfully Air Boost 100 times
Steel Container Successfully Use 50 Power Ups

Tails and Tornado Attack your Rival 4 times in a Race
Tails Icon Finish a Race with 200 Rings
Tikal and Chaos Win a match of Knock Out without being knocked out

Unbreakable Container Successfully Use 100 Power Ups
Unidos Get the High Score in the Zone 3 Boss

Water Blue Ring Collect 500 Rings with Rouge
Wooden Container Successfully use 25 Power Ups

ZERO Get the High Score in Zone 6 Act 3

Unlock Different Chao Detectors

Zone 1 Chao Detector Get the High Score in Zone 1 Act 3
Zone 2 Chao Detector Get the High Score in Zone 2 Act 3
Zone 3 Chao Detector Get the High Score in Zone 3 Act 3
Zone 4 Chao Detector Get the High Score in Zone 4 Act 3
Zone 5 Chao Detector Get the High Score in Zone 5 Act 3
Zone 6 Chao Detector Get the High Score in Zone 6 Act 3

Unlock Different Cups

Espio Cup Defeat the Ifrit with Espi
Espio Cup Defeat the Ifrit with Rouge

Knuckles Cup Defeat the Ifrit with Knuckles

Metal Cup Defeat the Ifrit with Metal Sonic

Shadow Cup Defeat the Ifrit with Shadow
Silver Cup Defeat the Ifrit with Silver
Sonic Cup Defeat the Ifrit with Sonic

Tails Cup Defeat the Ifrit with tails

Unlock Race Suits

Espio's Knight Suit Win Espio Cup in Single Player
Espio's Mummy Suit Beat silver 20 times with Espio
Espio's Ninja Suit Win Espio Cup in Single Player
Espio's Race Suit use Espio's Signature Move 20 times.

Knuckles's Armor Suit Win Knuckles Cup in Single Player
Knuckles's Eggman Suit Win Knuckles Cup in Single Player
Knuckles's Gladiator Suit Beat Rouge 20 times in any mode with Knuckles
Knuckles's Race Suit Attack any rival 50 times with Knuckles

Metal Sonic's Circuits Suit Win Metal Cup in Single Player
Metal Sonic's Jester suit Beat Tails 20 times with Metal Sonic
Metal Sonic's Mach 3.0 Suit Successfully copy every Rival's Signature Moves with Metal Sonic
Metal Sonic's Mach2.0 Suit Win Metal Cup in Single Player

Rouge's Armor Suit Beat Knuckles 20 times with Rouge
Rouge's Race Suit Collect 500 Rings with Rouge
Rouge's Raider Suit Win Rouge Cup in Single Player
Rouge's Stealth Suit Win Rouge Cup in Single Player

Shadow's 80's Suit Win Shadow Cup in Single Player
Shadow's Flame Suit Win Shadow Cup in Single Player
Shadow's Mercenary Suit Beat Sonic 20 times in any mode while using Shadow
Shadow's Race Suit Use Shadow's Chaos Control 20 times.
Silver's Christmas Suit Win Silver Cup in Single Player
Silver's Cyber Suit Beat Espio 20 times in any mode with Silver
Silver's Lightning Suit Win Silver Cup in Single Player
Silver's Race Suit Use Silver's Signature Move on any Rival 20 times
Sonic's Black Tie Suit Beat Shadow 20 times in any mode with Sonic
Sonic's Cheetah Suit Win Sonic Cup in Single Player
Sonic's Ice Suit Win Sonic Cup in Single Player
Sonic's Race Suit Run 15,000 meters with Sonic

Tails's Ace pilot Suit Log 3 minutes of fly time with Tails
Tails's Captain Suit Win Tails Cup in Single Player
Tails's Tiger Suit Beat metal sonic 20 times with Tails.
Tails's Zebra Suit Win Tails Cup in Single Player