It is now almost a quarter of a century since the original version made its 1978 debut in the arcades of Japan. Space Invaders immediately proved to be so incredibly popular that it created a countrywide shortage of 100-Yen coins, as players pumped money into the machines to enjoy the thrill of the game. Since then, Space Invaders has generated a significant amount of revenue. The mobile version of Space Invaders is a faithful recreation of the original arcade game, featuring full sound, advanced scoring systems, and a unique use of the phone's vibrate function.