TRSrockin.com: "Released in 1989, the Nintendo Game Packs was a series from Topps that consisted of 60 scratch-off game cards and 33 stickers from six NES games: Super Mario Bros., Super Mario Bros. 2, The Legend of Zelda, Zelda II: The Adventure of Link, Punch-Out!!, and Double Dragon. Each of the stickers had a "top secret tip" for one of the games on the back. Each series of the scratch-off cards followed a particular game, with 10 cards per set. The goal was to uncover certain symbols while avoiding enemy symbols."
- via Vintage Computing