Glk/ZCode

Frotz
Engine developer	David Griffith, dreammaster
Companies that used it	Infocom and others
Games that use it	innumerable games
Date added to ScummVM	2018-12-09
First release containing it	None

About

Frotz is the most popular Z-machine implementation, developed by Stefan Jokisch to play games adhering to the different Z-machine versions of text-based games, first introduced for the Zork series and following games by Infocom, then later Graham Nelson's Inform that became the de facto standard for interactive fiction.

Games

Infocom games:

• Zork I: The Great Underground Empire (1980)
• Zork II: The Wizard of Frobozz (1981)
• Zork III: The Dungeon Master (1982)
• Deadline (1982)
• Starcross (1982)
• Suspended: A Cryogenic Nightmare (1983)
• The Witness (1983)
• Infidel (1983)
• Planetfall (1983)
• Enchanter (1983)
• Sorcerer (1984)
• Seastalker (1984)
• Cutthroats (1984)
• The Hitchhiker's Guide to the Galaxy (1984)
• Suspect (1984)
• A Mind Forever Voyaging (1985)
• Wishbringer: The Magick Stone of Dreams (1985)
• Spellbreaker (1985)
• Ballyhoo (1986)
• Hollywood Hijinx (1986)
• Leather Goddesses of Phobos (1986)
• Moonmist (1986)
• Trinity (1986)
• Border Zone (1987)
• Bureaucracy (1987)
• The Lurking Horror (1987)
• Nord and Bert Couldn't Make Head or Tail of It (1987)
• Plundered Hearts (1987)
• Stationfall (1987)
• Beyond Zork (1987)
• Zork Zero (1988)
• Sherlock: The Riddle of the Crown Jewels (1988)
• Arthur: The Quest for Excalibur (1989)
• James Clavell's Shōgun (1989)
• Journey: The Quest Begins (1989)
• Zork: The Undiscovered Underground (1997) (developed by Activision)

Converted from Alan2:

• Dinnertime (1999)
• Mazemapper (1999)
• The Mean Story (1999)
• To Get to the Other Side (1999)
• They're After You! (1999)

Converted from ScottFree - Adventure International games:

• Adventureland (1978)
• Pirate Adventure, a.k.a. Pirate Cove (1979)
• Mission: Impossible, a.k.a. Impossible Mission, a.k.a. Secret Mission (1979)
• Voodoo Castle (1979)
• The Count (1979)
• Strange Odyssey (1979)
• Mystery Fun House (1979)
• Pyramid of Doom (1979)
• Ghost Town (1980)
• Savage Island, Part I and II (1981)
• The Golden Voyage (1981)
• Sorcerer of Claymorgue Castle (1982)
• Return to Pirate's Isle (1983)
• The Adventures of Buckaroo Banzai Across the 8th Dimension (1984)
• Questprobe: Featuring the Hulk a.k.a Marvel Adventure #1 (1984)
• Questprobe: Featuring Spider-Man (1984)
• Questprobe: Featuring the Human Torch and the Thing (1985)

Converted from ScottFree - Mysterious Adventures series:

• Mysterious Adventures 1: The Golden Baton (1981)
• Mysterious Adventures 2: The Time Machine (1981)
• Mysterious Adventures 3: Arrow of Death Part 1 (1981)
• Mysterious Adventures 4: Arrow of Death Part 2 (1982)
• Mysterious Adventures 5: Escape from Pulsar 7 (1982)
• Mysterious Adventures 6: Circus (1982)
• Mysterious Adventures 7: Feasibility Experiment (1982)
• Mysterious Adventures 8: The Wizard of Akyrz (1983)
• Mysterious Adventures 9: Perseus and Andromeda (1983)
• Mysterious Adventures 10: Ten Little Indians (1983)
• Mysterious Adventures 11: Waxworks (1983)

Converted from Miscellaneous architectures:

• Super Star Trek (1971-1974) (converted from BASIC to C to Inform)
• Colossal Cave Adventure (I: 1975-1977, II: 1978-1981, 2.5: 1995, 3: 1978, 4: 1995, 5: 1978, 6: 1984, 370: 1993) (converted from Fortran/C to Inform)
• Zork (1978) (the original release by the team that would become Infocom at MIT, converted to Inform) (converted from Fortran to Inform)
• Frankenstein Adventure (1981) (converted from TRS-80 to Inform)
• The Nine Dancers (1986) (converted from BBC to Inform)
• Werner's Quest 1: The Black Ladder (1985) (converted from The Quill Adventure System to Inform)
• Werner's Quest 2: Revenge of the Thing-Fish (1985) (converted from The Quill Adventure System to Inform)
• Werner's Quest 3: Rance the Dungeonkeeper (1985) (converted from The Quill Adventure System to Inform)
• Werner's Quest 4: Unchanter (1985) (converted from The Quill Adventure System to Inform)
• Snafufun (1988) (converted from BASIC to Inform)
• The Puppet-Man (1987) (converted from BBC to Inform)
• Paranoia (1987) (converted from C to Inform)
• Odieus' Quest for the Magic Flingshot (1993) (converted from LADS (Levy's Adventure Development System) to AGT (Adventure Game Toolkit) to Inform)
• Freefall (1995) (Inform version of the 1984 game Tetris)
• Robot Finds Kitten (1997) (converted from C to Inform)
• Reverzi (1999) (Inform version of the board game Reversi, also known as Othello)
• Chaos In Space (2001) (aka Warp!) (converted from DOS to Inform)
• HLA Adventure (2004) (converted from HLA (high level assembly) to Inform)

Other:

• 69,105 (2009)
• The Angel Curse (2003)
• Bob's Garage (2006)
• Cheeseshop (2002)
• Color of Milk Coffee (2012)
• Four Days of Summer (2017)
• Fajfeta sur la Luno (2020)
• The Fox, The Dragon, and The Stale Loaf of Bread (2005)
• Kraketoa Tuna Melt (2002)
• Not Just A Game (2000)
• A Reading in May (2012)
• Le Roi de Fihnargaia (2010)
• A speedIF O entry (2001)
• Squeaky on the Moon (2001)
• This is the game that I wrote (2006)
• Yay Games (2009)

Status

A work-in-progress sub-engine of the new Glk API has been added based on Frotz.

External links

• Other Frotz ports on the IF Archive
• Wikipedia article on the Z-machine
• IF Archive list of free Z-code games