How to unlock the cards in the game.

Card	How to unlock
Amy in the City	Win a Ring Battle without hurting a rival.
Amy Rose	Get the high score in Zone 3 Act 1.
Beat	Set the high score in the Zone 4 Boss level.
Big and Froggy	Win a Capture The Chao match without losing any Chaos.
Blaze the Cat	Set the high score in Zone 5 Act 1.
Blue Falcon	Get an "S" rank in Zone 1 Act 2.
Blue Ma Djinn	Get an "S" rank in Zone 2 Act 3.
Blue World Ring	Copy the signature move of all rivals with Metal Sonic.
Bronze Medal	Counter five attacks.
Buzz Bomber	Win twenty Spin Dash Starts.
Capsule	Successfully Speed Boost 100 times.
Chao (Dark Power)	Find all Chaos in Zone 1 Act 1.
Chao (Dark Run)	Get an "S" rank in King of the Hill.
Chao (Normal Fly)	Get an "S" rank in Capture the Chao.
Chao (Normal Power)	Get an "S" rank in Ring Battle.
Chao (Normal Run)	Get an "S" rank in Tag.
Dragonfly	Set the high score in Zone 3 Act 3.
E1000	Set the high score in the Zone 5 Boss level.
Egg Bull	Get an "S" rank in Zone 6 Act 2.
Egg Cannon	Get an "S" rank in Zone 3 Boss level.
Egg Cerberus	Get an "S" rank in Zone 4 Act 2.
Egg Chao	Find all Chao in Zone 1 Act 3.
Egg Dealer	Get an "S" rank in Zone 1 Boss level.
Egg Guardian	Get an "S" rank in Zone 4 Act 1.
Egg Gunner	Get an "S" rank in Zone 3 Act 3.
Egg Keeper	Get the High Score in Zone 5 Act 3.
Egg Pawn (Casino version)	Win Shadow Cup in Single Player.
Egg Pawn	Get an "S" rank in Zone 5 Act 1.
Egg Rounder	Get an "S" rank in Zone 3 Act 2.
Egg Wyvern	Get an "S" rank in Zone 4 Act 3.
Gohla	Get the High Score in Zone 4 Act 3.
Green Ma Djinn	Get an "S" rank in Zone 2 Act 1.
Guardon Crab	Get an "S" rank in Zone 5 Act 2.
Gun Hunter	Set the high score in Zone 6 Boss level.
Hint Box	Successfully use ten Power Ups.
Ifrit	Get an "S" rank in Zone 5 Boss level.
Item Box	Attack a rival 100 times.
Item Box	Attack a rival 250 times.
Item Box	Successfully use Air Boost 25 times.
Jack Bommer	Win the Silver Cup in Single Player mode.
Knuckles and Master Emerald	Attack a rival eight times in a race.
Knuckles the Echidna	Get the High Score in Zone 6 Act 1.
Knuckles	Attack any rival fifty times as Knuckles.
Mephiles	Get an "S" rank in Knock Out.
Metal Sonic	Use Shadow's Chaos Control twenty times.
Miles "Tails" Prower	Win twenty Single Events.
Moto Bug	Stay in first place and win.
Nebula	Set the high score in Zone 1 Act 3.
Newton	Smash 100 containers.
Omochao	Defeat the Ifrit as Silver.
Penguinator	Set the high score in Zone 2 Act 3.
Pointdexter	Set the high score in the Zone 2 Boss level.
Princess Elise	Set the high score in Zone 1 Act 1.
Red Ma Djinn	Get an "S" rank in Zone 2 Act 2.
Rexon	Set the high score in the Zone 1 Boss level.
Ring	Collect 1,000 Rings.
Rouge the Bat	Get the High Score in Zone 4 Act 1.
Shadow the Hedgehog (Bike)	Get an "S" rank in Zone 6 Boss level.
Shadow	Defeat Sonic twenty times as Shadow.
Silver Medal	Counter ten Attacks.
Soleanna	Set the high score in Zone 2 Act 1.
Sonic (Christmas)	Attack a rival 25 times.
Sonic (Soccer)	Collect 250 Rings.
Sonic (Swimming)	Collect 5,000 Rings.
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	Complete a Battle with 500 Rings.
Sonic the Hedgehog 2	Defeat the Ifrit with Shadow.
Sonic the Hedgehog	Destroy 10 Badniks.
Sonic the Hedgehog	Destroy 20 Badniks.
Sonic the Hedgehog	Destroy 30 Badniks.
Sonic with Ring	Use 10 Boost Panels successfully.
Sonic with Ring	Use 100 Boost Panels successfully.
Sonic with Ring	Use 50 Boost Panels successfully.
Spring	Successfully Air Boost 100 times.
Spring	Successfully Speed Boost 25 times.
Steel Container	Successfully use 50 Power Ups.
Tails and Tornado	Attack a rival four times in a race.
Tails Icon	Finish a race with 200 Rings.
Tikal and Chaos	Win a match of Knock Out without getting knocked out.
Unbreakable Container	Successfully use 100 Power Ups.
Unidos	Set the high score in the Zone 3 Boss level.
Water Blue Ring	Collect 500 Rings as Rouge.
Wooden Container	Successfully use 25 Power Ups.
ZERO	Set the high score in Zone 6 Act 3.