Players often have ideas about a game while playing it, but turning them into changes usually means stepping out of play to edit it. We built PATCH FIGHTER, a two-player fighting game defined by 91 types of adjustable parameters. A large language model (LLM) reads players' conversations during play and rewrites these parameters between games, so players can change the game just by talking. We conducted a within-subjects experiment with 27 pairs (54 participants) comparing three conditions, solo play, paired play, and paired watching. Participants rated enjoyment after each game and answered a questionnaire on speech and changes after each condition. Paired play was the most enjoyable condition. In paired play, participants also felt more able to say what they thought about the game than in solo play. In interviews, participants valued talking with the partner and checking changes through their own play. Paired watching was less preferred because they could not try the changes themselves. As our design cannot separate the enjoyment of editing from that of play, we outline a design that measures them separately and the evaluation of the resulting games as future work.

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