Atari 400/800/XL/XE/XEGS systems
∑ 3 versions exist. Sierra released versions by both Chuck Benton (tape only? pictures #1 and #2) and John Harris (tape and disk - picture #3). Chuckís version offers head-to-head play for 2 players. Johnís tape version differs from his disk version in that it doesnít have any music, otters, or an option to save high scores. Parker Brothers released a cart version (picture #4), which was actually a modified version of Sierraís (John Harrisís) code under an agreement with them. The PB version has a 2-player option, improved graphics, and only 8k (no music during the game, only at the beginning of a level), compared to Johnís.