Amazing project that trained the GPT-2 language model on text adventure games, producing a game that allows arbitrary prompts!
Game: https://aidungeon.io/
About: https://pcc.cs.byu.edu/2019/11/21/ai-dungeon-2-creating-infinitely-generated-text-adventures-with-deep-learning-language-models/
(Ironic that a text game has large GPU requirements to run too.)