ladders) Adding enemies and obstacles Rearrangement of items More dark rooms and fewer torches (in level 9, the entire pyramid is dark) Enemies that do not disappear after they kill Panama Joe (starting with level 5) The player can reach only the left half of the pyramid in level 1, and only the right half in level 2. Starting with level 3, the entire pyramid is open for exploration. The sound track of the game for the Atari 8 bit computer is a musical adaptation of Spanish Flea and the first few notes of La Cucaracha when collecting items. Development Robert Jaeger had previously written Chomper (a Pac-Man clone) and Pinhead (a Kick Man clone). In 1983, Jaeger's friend Mark Sunshine suggested Jaeger make a game with a Meso-American theme and call it Montezuma's Revenge. Jaeger, who was only 16 at the time, exhibited the still-unfinished game with his father at a consumer electronics convention. Parker Brothers officials expressed interest and quickly convinced Jaeger to sign the rights over to them. On the title screen of the shipping game, Mark Sunshine is credited for the concept. The original game that Jaeger developed for the Atari 800 required 48K of memory. Parker Brothers wanted to release the game on cartridge, so they trimmed it down to fit in 16K. One feature removed from the disk version was an unfinished boss fight with a gigantic King Montezuma who can stomp the player character to death. Parker Brothers released versions for the ColecoVision, Atari 2600, and Atari 5200 consoles, and for the Apple II, Commodore 64, IBM PC, and Atari 8-bit computers. To reduce costs, Parker Brothers released the Commodore 64 and Atari 8-bit versions on disk instead of cartridge. In the UK and Ireland it was also released on cassette tape for the Atari and Commodore 64 . The C64 and Atari versions came on a single flippy disk–likewise for the IBM PC and Apple II versions. The IBM PC port uses a CPU-based speed loop and is too fast to be playable on 286 and up machines. A cassette tape version was developed separately in the UK for the Sinclair Spectrum. The Atari 2600 cartridge is 8K and has half the levels of the other versions. Reception Computer and Video Games rated the ColecoVision version 87% in 1989. The games sold over 600,000 copies by 1997. Legacy In 1998 a 3D