Sierra Game Compiler

Sierra adventures, on your own hardware

AGI-64 is available now. The free Sierra Game Compiler for Windows 2.3.8 brings fourteen original Sierra AGI titles and three fan-made adventures to the Commodore 64. The same download includes AGI-ANTIC, supporting 17 adventures for Atari 8-bit computers.

There is something special about exploring Daventry or stepping aboard the Arcada on a classic machine. AGI-64 brings these adventures to the C64's own display, sound, keyboard, and pace.

Download the free Windows compiler · v2.3.8. AGI-64 downloads and compiler updates are available from meanhamster.com.

Download for Mac (Apple Silicon) · v2.3.8 · macOS 14 or newer

Download for Mac (Intel) · v2.3.8 · macOS 14 or newer

One library, from originals to ready-to-play games

Browse platform tabs and screenshot cards in the same library on Windows, Apple Silicon Mac and Intel Mac. Choose your game folder, including supported network folders, then use Check files to confirm the original edition and Include to select it. File locations and selections are remembered for each platform.

Review & Prepare shows your choices, estimated game sizes and before/after storage before building. You can cancel preparation and keep completed games; the finished report lists what succeeded and offers a log if something needs attention. Featured and Included views help you find favourites and selected games quickly.

Familiar controls, reliable saves

Play with the original keyboard controls or supported mouse walking on C64. On Atari, arrow keys work without Control for walking, menus and inventory. Control+arrows still work; Control+1 through Control+9/0 handle function-key actions, HELP handles F1 and TAB opens inventory/status where supported. On-screen help uses the matching controls for your computer.

Atari games offer six save slots with room and score details, overwrite confirmation and recovery from a damaged newest save. The Windows compiler includes a save-disk backup and restore utility. Existing saved-game formats remain compatible when you recompile a supported edition.

Designed for classic-computer speed

Background pre-processing, faster game-script checks, unused-code trimming and automatic room-performance management help these adventures fit and run on their original hardware. Reports show room budgets while preserving gameplay behaviour. Current game updates include King’s Quest I’s well and beanstalk routes and picture overlays, King’s Quest III’s opening and colours, and Mixed-Up Mother Goose’s text and walking.

Follow the native game tutorial for your first build, or check the expected game editions and cartridge requirements.

C64 menus, dialog boxes and command input use high-resolution text alongside the original color artwork.

Atari 800, welcome to Daventry!

Explore The Black Cauldron, Donald Duck's Playground, Gold Rush!, Mixed-Up Mother Goose, King's Quest I, King's Quest II, King's Quest III, King's Quest IV (AGI edition), Leisure Suit Larry, Manhunter: New York, Manhunter 2: San Francisco, Police Quest, Space Quest I, Space Quest II, Space Quest 0: Replicated, King's Quest VI AGI demake, Space Quest: The Lost Chapter through AGI-ANTIC. The Atari's colors and character give Daventry a look of its own, and seeing Graham outside the castle on another of our favorite machines is a real treat. AGI-ANTIC is included in the same free compiler, with all 17 adventures supported.

AGI-ANTIC minimum requirements: Atari XL/XE with at least 64K RAM, or an Atari 800 with an Incognito board or similar upgrade. King's Quest II, Police Quest and Space Quest II require a MegaMax 2 MB cartridge.

Bring your own game files

You must supply the original game data from your own copies. No Sierra games or game data are included. Choose a source folder in the compiler; it checks the game and edition before building. Use the original AGI editions in the supported list below.

For the C64, choose 1, 2 or 4 MB EasyFlash, or 2 MB MegaCart / Magic Desk 16K. Expanded EasyFlash images need compatible hardware and firmware; our upgrades support them on TeensyROM+ and Kung Fu Flash 2. See the cartridge requirements and the compiler's Help for setup and controls.

Supported games

Commodore 64 · 17 titles

• The Black Cauldron
• Donald Duck's Playground
• Gold Rush!
• Mixed-Up Mother Goose
• King's Quest I
• King's Quest II
• King's Quest III
• King's Quest IV (AGI edition)
• Leisure Suit Larry
• Manhunter: New York
• Manhunter 2: San Francisco
• Police Quest
• Space Quest I
• Space Quest II

Plus three fan-made adventures: Space Quest 0: Replicated, King's Quest VI AGI demake, Space Quest: The Lost Chapter.

Atari 8-bit · AGI-ANTIC: The Black Cauldron, Donald Duck's Playground, Gold Rush!, Mixed-Up Mother Goose, King's Quest I, King's Quest II, King's Quest III, King's Quest IV (AGI edition), Leisure Suit Larry, Manhunter: New York, Manhunter 2: San Francisco, Police Quest, Space Quest I, Space Quest II, Space Quest 0: Replicated, King's Quest VI AGI demake, Space Quest: The Lost Chapter are supported.

C128, MSX2, TI-99/4A and Coleco ADAM

Commodore 128: native King’s Quest I and Space Quest I are included in the same compiler. Choose C128 in the library to prepare the matching edition.

MSX2, Coleco ADAM and TI-99/4A · Highly Experimental: King's Quest I and Space Quest I. MSX2 needs 64 KB RAM and a V9938/V9958 with 128 KB VRAM. ADAM needs 128 KB total RAM. TI-99/4A needs the standard 32 KB RAM expansion. These games run on the target computer’s own CPU. Packaged builds have been checked; full-game and real-hardware testing remain open.

ADAM Standard and F18A Enhanced

Choose the standard ADAM editions or F18A Enhanced editions with GPU masking, additional colours and EGA-style artwork. King’s Quest I also has a dedicated F18A Enhanced 128K edition with improved graphics, a wider title, faster walking and repaired menus, including compatible Pico9918 systems. ADAM Standard remains a separate choice.

The dedicated enhanced King’s Quest I edition requires supported original game files, 128 KiB total RAM, 2 MiB disk support, and F18A v1.9 or Pico9918 F18A firmware 1.0.1+. All native platforms can be prepared directly on Windows or Mac. Check the game and system compatibility chart and compiler Help for the selected edition.

Other Games for C64

The same compiler also builds native C64 versions of Another World and M.U.L.E.+. Another World uses your original Amiga game files, including recognized two-disk editions, and requires a compatible 4 MiB EasyFlash setup. The compiler explains which files to supply. M.U.L.E.+ is included, with optional SID music support. Both run on the C64's own CPU.

Support applies to the game editions recognized by the compiler. If your files are not recognized, check the source edition before building.

In the news

• The Space Quest Historian Playing Space Quest 1 for C64!
• AGI-ANTIC game demos on YouTube
• Read The Oasis BBS's AGI-64 coverage
• Read the AGI-64 story on Zeli
• Join the Hacker News discussion
• Read Adafruit's AGI-64 coverage
• This Week in Retro 288: AGI-64 and Sierra adventures on C64 and Atari

Downloads, updates, and help

For changes by version, see the Sierra Game Compiler release notes in Support. The current compiler includes the game and preparation features described above.

Download Sierra Game Compiler for Windows 2.3.8, then use its update check for future releases. If you find a problem, the compiler's Report Bug button opens our contact form, where you can include a screenshot.

Download for Mac (Apple Silicon) · v2.3.8 · macOS 14 or newer

Download for Mac (Intel) · v2.3.8 · macOS 14 or newer

Report an AGI-64 issue · Read the launch news · Earlier development update