Note: If you own the first printing of Sushi Go Party (the first printing had issues with the cards being inconsistently sized), there will be a somewhat significant color variation between these cards and your cards.
Sukeroku is an appetizer pack included for free with purchases of Sushi Go Party! at conventions and also sold separately.
Sukeroku has Futomaki cards and Inari cards, both granting 2 points a piece. If, during scoring, a player has a pair of each type they gain 6 points (3 points each) instead.
For more information, visit the BGG listing.