LocalLLaMA

Not entirely, I mainly just use it as an open ended story. However, if I'm doing a second person text adventure, sometimes I will place information pertaining to the "game" and put it in memory (or system prompt, if in LM Studio), like this:

Scenario: Second person survival text adventure game set in the African savannah, hundreds of millions of years ago.

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Inventory: Stone knife, dried meat, berries (4), half-filled water skin.

Current quest: Go hunting

In my experience so far, it seems to do a really good job of remembering exactly whatever's in my inventory, and if my character picks something up in game, I add it to the memory.

If you wanted more game-like systems like stats and dice rolls, I suppose you could keep track of those externally, and your rolls could be done through a site like random.org and just tell the LLM your result.