Jetpac is a ZX Spectrum, VIC 20 and BBC Micro video game released in 1983 by Ultimate Play the Game.
Relevance to Donkey Kong
In Donkey Kong 64, players must score 5,000 points in this game to get the Rareware Coin, which is required to beat the game. You can play jetpac by going to cranky's lab and talking to Cranky. He will ask you if you want to play the game, and if you can get a high score.