Croaker (1983)(Aligata Software-Unicorn Software) ROM Download for Acorn Electron (). Croaker (1983)(Aligata Software-Unicorn Software) game is available to play online and download only on Late Games. Croaker (1983)(Aligata Software-Unicorn Software) ROM for Acorn Electron download requires an emulator to play the game offline. This Game is English (USA) Version and is the highest quality available.