Cool Jetpack Free V1. 0. Inspired on the great Jet Pac (ZX Spectrum) game, developed and released by Ultimate Play The Game in 1983, we launched CoolJet to celebrate 30 YEARS of this amazing soldier. Also, this is our Christmas gift to your. Merry Christmas! We hope you enjoy the journey! Graphics and coding made by CoolApps(e). All Rights Reserved. Greetings from Mars, www.