Once you have collected 50%, 90% and 100% of the cards, you will be able to see a new title screen.
Collect five coins and return to Joy Joy. Find Yosiki and challenge him to a game. Defeat him in the first game to recieve the Mech Zangief Card.
Break the Dust Dragon to open the back room in the Lost World where the Mega Crush Card is located. Now, win the tournament, then return to the back room. If Mask is in the room, the cabinet will be unlocked and you can get the Mega Crush Card.
Beat the game, then return to the semifinals room for a card auction.
In the middle of the round, enter the following to get these effects:
Ring Character: Up+B
Your Discards: Left + B
Enemy Discards: Right + B
Status: Down + B
These cards are all either Rarity A or S this can only be done on the Snk version.