There is no black card.
Someone was using a black card to avoid being distracted by Snoopy's antics during the piano game. Users will probably not need to do this.
There is no black card on the island. Someone who was distracted by his dancing during the piano playing had to resort to covering the screen with a card. Most players do not need to do that.
Well, on the lemon sucker item card it says "Linus's favorite" so you should bring it back inside and give it to him.
When the Black Widow catches you , you will have to pass the guard and at top you will use your card
you go to the art musem
You need action replay or the black card.
You only use the Black Widow key card at the end of the island, to open the sliding doors in her secret hiding place.
The key card is used later in the game in the Black Widow's lair. Save the key card and return to the museum.
The red card dropped by the Black Widow is a key card that opens the vault in her underground lair. If you return to the museum after picking up the card, you will receive a package that takes you to another island, to enable you to find the missing painting.
You'll need it later on to get into Black Widows' Lair.
You do this near the end of the game, when you are in the lair of the Black Widow.
The Black Widow key card is dropped by the art thief (shady guy) when he makes his escape by boat.
When you are in the Black Widow's secret headquarters, and go past the guards, there is a door with a lock requiring the Black Widow card. Press USE on the card and it opens the door to where you fight the Black Widow.