The game uses Sierra's SCI1.1 engine and features 256-color hand-drawn art, scaling sprites, and a point-and-click interface. Freddy Pharkas ran under both DOS and Windows 3.1. It was released in both floppy disk and CD-ROM versions, the latter having full voiceover speech for all characters. The game's manual is entitled The Modern Day Book of Health and Hygiene, a parody of 19th century medical texts. It contains information necessary for solving prescription puzzles. As a form of copy protection, the player must concoct prescriptions for Freddy's patients using recipes found in the user's manual. An incorrect prescription will result in the customer returning angrily, but does not end the game. In the game, the player takes the role of Freddy Pharkas, an 1880s-era pharmacist in the town of Coarsegold, California which was the location of Sierra's headquarters in 1993. Freddy was once a gunslinger, but sought a new career after his last gunfight, in which "Kenny the Kid" (a reference to the infamous outlaw Billy the Kid) shot off one of his ears. Throughout the town, businesses are either being bought or proprietors are being scared out of town. Someone is obviously trying to take over the entire area, but who? And why? The slimy sheriff, Checkum P. Shift doesn't seem eager to help, so it's up to Freddy to find out the details. The cast includes the town's eccentric old man and story narrator Whittlin' Willy, Srini (Freddy's "Injun" sidekick – actually East Indian), Doc "Dizzy" Gillespie the drunken town doctor, the cafe owner Helen Back, otherwise known as Mom and her stereotypical Chinese chef Hopalong Singh (a reference to Hop Sing, the cook on Bonanza), the crooked banker Phineas (P.H.) Balance, town schoolmarm (and Freddy's love interest) Penelope Primm, and Madame Ovaree, who runs the local brothel. The villain "Kenny the Kid" is a cartoonish version of Sierra's then-president Ken Williams. Madame Ovaree's name is an obvious parody of Madame Bovary and (as evidenced by her occupation) ovaries. Also, there are some anachronisms in the game, such as Srini mentioning him being on Pakistani time, but Pakistan did not exist at the time the game is set, as the region where the country is located was still a part of India at that time, and Pakistan did not become a country until 1947, 67 years after the game's setting.