Shadowkeep

A 1991 Mac Shareware RPG by Glenn Seemann.

Not to be confused with Shadowkeep, a mid-1980s RPG by Trillium.

Tropes used in Shadowkeep include:

• Cosmic Keystone (The Ankh)
• Dronejam
• Experience Points (Subverted; they're only good for Scoring Points)
• Evil Overlord ("The Evil Overlord")
• Fumbling the Gauntlet (Do not enter Shadow Keep with your weapon drawn)
• Healing Potion
• Hit Points
• Interchangeable Antimatter Keys ("Magic Keys")
• Nightmare Fuel (The laughing cartoon demon superimposed over the interface when you die)
• Plot Coupon (Several)
• Roaming Enemy (The outdoors is crawling with Giant Spiders, Scary Scorpions, and Goddamned Bats)
• Shareware (The author requests a "measly ten bucks" if you "don't want to burn in the fires of hell for all eternity")
• Shoplift and Die (The castle's treasure room)
• Shout-Out (John, the paper airplane enthusiast)
• Sword of Plot Advancement (The Black Sword)
• Trauma Inn
• Unicorn
• Universal Poison (Averted; spider and scorpion venom have separate antidotes)
• Walk It Off
• We Buy Anything (Averted; a shop will only buy the same sorts of items it sells)
• When Trees Attack
• Wide Open Sandbox
• Wizard Needs Food Badly
• Ye Olde Butcherede Englishe