Jonny Quest In Doctor Zin's Underworld (1991)(Hi-Tec Software)[cr The Spirit][48-128K] ROM Download for ZX Spectrum (TAP). Jonny Quest In Doctor Zin's Underworld (1991)(Hi-Tec Software)[cr The Spirit][48-128K] game is available to play online and download only on Late Games. Jonny Quest In Doctor Zin's Underworld (1991)(Hi-Tec Software)[cr The Spirit][48-128K] ROM for ZX Spectrum download requires an emulator to play the game offline. This Game is English (USA) Version and is the highest quality available.