Squishword is a simple first exploration of that. There's a tutorial so I won't explain all the mechanics. Simply: you try to move from one word to another by adding, subtracting, joining and dividing words. For example: "dog" splits into "bark" and "animal". You can do clever things like take "bark" + "plant" and make "tree". The inspiration comes from the "Wikipedia game" where you try to move from one random article to another just by clicking links.
Tuning the judge behavior for fair results took a lot of work, and I'm not 100% happy with it yet. I built more tools and visualizations than features in the game itself. Like the 11x11 matrix of logic and wit grades for every move, to try to get the judge distribution more even. This is a "simple" example of LLMs in a product, so I'm curious how more complex workflows are dealing with it.