The games

Twenty-three titles — thirteen released for the Commodore 64, three for the Spectravideo 328 under the M&M Software name, two earlier TRS-80 adventures, and five that were finished enough to boot but never shipped.

• Forbidden Valley TRS-80
• The Secret of Flagstone Manor TRS-80

• Now playable on a Commodore 64

  Neither TRS-80 game was ever released for the C64, but both can be played on one now.

  • Forbidden Valley — re-created from Betts’s design notebook, as no copy survives. Download the .d64
  • The Secret of Flagstone Manor — converted from Betts’s 1981 BASIC listing. Download the .d64

  Modern versions made for this archive — not Mountain Valley releases. They run in VICE or any C64 emulator.

• The Oasis of Shalimar Commodore 64
• Mystery Island Commodore 64
• King Solomon's Mines Commodore 64
• Castle of Mydor Commodore 64
• The Gambler Commodore 64
• The Lost City Commodore 64
• The Scroll of Akbar Khan Commodore 64
• Himalayan Odyssey Commodore 64
• The Volcano of Raka-Tua Commodore 64
• The Secret of Smugglers Inn Commodore 64
• Escape from Raka-Tua Commodore 64
• Dark Planet Commodore 64
• The Mermaid and the Crown Commodore 64

• Sorcerers of Ravenswood UnreleasedCommodore 64
• Treasure of Dead Man's Cay UnreleasedCommodore 64
• Crypt UnreleasedCommodore 64
• The Curse of Cranbury Manor UnreleasedCommodore 64
• Ophir UnreleasedCommodore 64

• Planet Zandell Spectravideo 328 · as M&M Software
• Volcano Island Spectravideo 328 · as M&M Software
• The Lost Princess Spectravideo 328 · as M&M Software