jump and incapacitates one of the player's three team member characters. The player must return to the Ghostbusters headquarters at intervals to empty the traps and/or revive any incapacitated team members. As the game progresses, the player must also keep free-roaming ghosts from reaching the temple of Zuul for as long as possible; each one that does so adds to the PK energy level. The ghosts occasionally merge to form the Stay Puft Marshmallow Man, who will attempt to trample a city block. Stopping such an attack earns a bonus, but each failure to do so deducts money. If the player has not earned more money than the total spent on equipment when the PK energy level reaches its maximum of 9999, the game ends immediately. Otherwise, the player must guide at least two Ghostbusters past Mr. Stay Puft in order to destroy the temple of Zuul. The game ends afterward, with the player earning a reward if successful. In some versions, including those for the Apple IIe and Commodore 64, the player is given an account number upon completing the game. Entering this number at the initial screen allows the player to start a New Game Plus with the cash balance from the end of the previous game, enabling the purchase of more expensive equipment. Speech samples Most versions of the game feature a sampled rendition of the "Ghostbusters!" cry at the start of the movie's theme song; on the C64 and Atari 8bit versions, this was produced within the game using a patented form of compression similar to ADPCM by ESS (Electronic Speech Systems), all without requiring external hardware to produce the speech. The PCjr/Tandy port does not have this feature. Ports Ghostbusters was ported to the IBM PCjr and Tandy 1000 in 1985. Due to timing-sensitive raster effects the game uses, it is incompatible with Tandy machines other than the 1000/1000A, 1000HX, and 1000EX, all of which use a 4.77Mhz 8088 CPU. The game was ported to the Atari 2600 by programmer Dan Kitchen (brother of Garry Kitchen), shortly before he ported Kung-Fu Master to the Atari 2600. Reception Sales Ghostbusters topped the monthly UK software sales charts for three months in early 1985, from January to March. Released before the film in the UK, it went on to be the UK's fourth best-selling home video game of 1985. In 1985, it and The Print Shop were