It's a simple text adventure game engine. It looks like this:

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The Lost Kingdom

You are a brave explorer on a quest to find the lost kingdom of an ancient civilization.

You are in a mysterious cave with passageways leading in different directions.

What do you want to do? look

You are in a mysterious cave with passageways leading in different directions.

I see here: a glowing gem

Exits: north

What do you want to do? take gem

Taken!

What do you want to do? look at gem

It's a glowing gem with an intricate pattern carved into its surface.

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An interesting new feature is that you can ask the computer to do non-scripted things, like:

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What do you want to do? eat gem

# Generating action...

You attempt to eat the gem, but it doesn't taste good. You spit it out and the gem is still in your possession.

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The game, the scenario, the objects -- everything was created by GPT-3, and the script just have to keep track of the game state.