Arcade Versions
Many copied arcade versions of the game exist with differences in background color and sound effects. Taito Corporation produced a version with a light-blue background that recycled many sound effects from Head On. The unit's cabinet and instruction card were created specifically for the version by Taito, but it is not known whether the version was a licensed manufacture or a copy. Hōei Sangyō (now Banpresto) produced an arranged version called Time Alien where alien movements are much quicker (however, the game lags whenever the player tries to dig or fill up a hole). In 1980, a North American version titled Digger (unrelated to the Canadian computer game Digger) was created by Sega and Gremlin Industries, with minor changes in appearance.
Read more about this topic: Heiankyo Alien, Related Games
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