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arXiv · 2603.17169

How Clued up are LLMs? Evaluating Multi-Step Deductive Reasoning in a Text-Based Game Environment

Rebecca Ansell·Autumn Toney-Wails
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Abstract

Deducing whodunit proves challenging for LLM agents. In this paper, we implement a text-based multi-agent version of the classic board game Clue as a rule-based testbed for evaluating multi-step deductive reasoning, with six agents drawn from GPT-4o-mini and Gemini-2.5-Flash. We further investigate whether fine-tuning on structured logic puzzles transfers to improved in-game reasoning and gameplay. Across 18 simulated games, agents achieve only four correct wins, indicating difficulty in maintaining consistent deductive reasoning over the course of a full game. Additionally, we find that fine-tuning does not reliably improve performance and, in some cases, appears to increase reasoning volume without improving reasoning precision.

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Rebecca Ansell, Autumn Toney-Wails. 2026-03-17. How Clued up are LLMs? Evaluating Multi-Step Deductive Reasoning in a Text-Based Game Environment. https://arxiv.org/abs/2603.17169

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