E.T.: The Extra-Terrestrial and the Cosmic Garden ROM Download for Gameboy Color (GBC). E.T.: The Extra-Terrestrial and the Cosmic Garden game is available to play online and download only on Roms Games. E.T.: The Extra-Terrestrial and the Cosmic Garden ROM for Gameboy Color download requires an emulator to play the game offline. This Game is English (USA) Version and is the highest quality available.