China

GUI agents powered by LLMs show promise in interacting with diverse digital environments. Among these, video games offer a valuable testbed due to their varied interfaces, with adventure games posing additional challenges through complex, narrative-driven interactions. Existing game benchmarks, however, lack diversity and rarely evaluate agents on completing entire storylines. To address this, we introduce FlashAdventure, a benchmark of 34 Flash-based adventure games designed to test full story arc completion and tackle the observation-behavior gap—the challenge of remembering and acting on earlier gameplay information. We also propose CUA-as-a-judge, an automated gameplay evaluator, and COAST, an agentic framework leveraging long-term clue memory to better plan and solve sequential tasks. Experiments show current GUI agents struggle with full story arcs, while COAST improves milestone completion by bridging the observation-behavior gap. Nonetheless, a marked discrepancy between humans and best-performing agents warrants continued research efforts to narrow this divide.

EMNLP 2025

FlashAdventure: A Benchmark for GUI Agents Solving Full Story Arcs in Diverse Adventure Games

evaluation methodologies

multimodality

benchmarking

## Welcome!
"I am excited to welcome you to this year’s edition of the Conference on Empirical Methods in Natural Language Processing! Importantly, it marks the 30th edition of EMNLP. With over 8,000 submissions, more than 3,000 accepted papers, and thousands of attendees, we have come a long way from that first
workshop, which had 14 accepted papers. As the field looks ahead, Suzhou is the fitting location for celebrating this milestone: rooted in a long literary tradition, yet modern and forward-looking, and home to a large share of the NLP community."<br>

*Message from the General Chair, Dirk Hovy*





<br>

Celebrate 30 Years of EMNLP! 
EMNLP 2025 will be held in Suzhou, China from November 5th to November 9th, 2025.

workshop paper

We present a multi-expert system for creating Non-Player Characters (NPCs) capable of both natural dialogue and contextual action execution in interactive environments. Our approach leverages Qwen3 as the base model with specialized Low-Rank Adaptation (LoRA) adapters to create three distinct expert modules: tool calling, tool response interpretation, and direct dialogue. The system not only meets but exceeds the computational constraints, delivering responses in an average of 3 seconds (well under the 7-second limit) on L40S GPUs while utilizing less than 30GB of the available 48GB VRAM, demonstrating efficiency alongside performance. This computational efficiency also contributes to reduced energy consumption and lower carbon footprint compared to less optimized approaches. The proposed solution achieved top performance in the Commonsense Persona-Grounded Dialogue Challenge 2025, securing the second position in the competition.

Efficient Tool-Calling Multi-Expert NPC Agent for Commonsense Persona-Grounded Dialogue

Large Language Models (LLMs) have demonstrated significant potential in story generation and role-playing, enabling the creation and exploration of novel content based on existing stories. However, previous interactive storytelling systems have shown limitations in immersion and agency. To address these challenges, we propose ECHIDNA, a novel two-stage framework designed around three core dimensions of interactive narrative systems: author intent, character autonomy, and player modeling. We employ Perturbation-Driven Branching to expand the interactive space in the generation stage and introduce the GM-NPC architecture to enable dynamic character responses and state management during the interactive narrative phase. The evaluation results show that ECHIDNA achieves superior performance in creating diverse branching narratives and providing engaging interactive experiences compared to existing methods. Our code and prompts are available at https://github.com/MoidzzZ/Echidna.

Explore Branches the Story didn't Narrate: An LLM Solution

The rise of Large Language Models (LLMs) has enabled a new paradigm for bridging authorial intent and player agency in interactive narrative. We consider this paradigm through the example of Dramamancer, a system that uses an LLM to transform author-created story schemas into player-driven playthroughs. This extended abstract outlines some design techniques and evaluation considerations associated with this system.

Design Techniques for LLM-Powered Interactive Storytelling: A Case Study of the Dramamancer System

Tabletop role-playing games (TRPGs) require game masters (GMs) to manage complex scenarios, enforce rules, and maintain narrative consistency. Large language models (LLMs) have shown promise as automated GMs, but preliminary experiments reveal challenges such as rule violations, scenario deviations, and giving spoilers. To address these issues, we propose a multi-agent system in which specialized LLM agents provide feedback to refine GM responses.Experimental evaluation with experienced TRPG players showed that the multi-agent approach improved scenario progression, but also led to increased rule violations and spoilers due to inappropriate feedback from agent. Furthermore, response times were slower, negatively impacting conversational smoothness. These results highlight both the potential and current limitations of multi-agent LLM-based TRPG game mastering, suggesting directions for future improvement.

TRPG Game Mastering Using LLM-Based Multi-Agent System

Human-like virtual characters are crucial for games, storytelling, and virtual reality, yet current methods rely heavily on annotated data or handcrafted persona prompts, making it difficult to scale up and generate realistic, contextually coherent personas. We create the first QA dataset for BaZi-based persona reasoning, where real human experiences categorized into wealth, health, kinship, career, and relationships are represented as life-event questions and answers. Furthermore, we propose the first BaZi–LLM system that integrates symbolic reasoning with large language models to generate temporally dynamic and fine-grained virtual personas. Compared with mainstream LLMs such as DeepSeek-v3 and GPT-5-mini, our method achieves a 30.3%–62.6% accuracy improvement. In addition, when incorrect BaZi information is used, our model's accuracy drops by 20%–45%, showing the potential of culturally grounded symbolic–LLM integration for realistic character simulation.

BaZi-Based Character Simulation Benchmark: Evaluating AI on Temporal and Persona Reasoning

This paper explores the application of Large Language Models (LLMs) and reasoning to predict Dungeons \& Dragons (DnD) player actions and format them as Avrae Discord bot commands. Using the FIREBALL dataset, we evaluated a reasoning model, DeepSeek-R1-Distill-LLaMA-8B, and an instruct model, LLaMA-3.1-8B-Instruct, for command generation. Our findings highlight the importance of providing specific instructions to models, that even single sentence changes in prompts can greatly affect the output of models, and that instruct models are sufficient for this task compared to reasoning models.

Does Reasoning Help LLM Agents Play Dungeons and Dragons? A Prompt Engineering Experiment

Large language model (LLM) agents have shown impressive capabilities in human language comprehension and reasoning, yet their potential in cybersecurity remains underexplored. We introduce DefenderBench, a practical, open-source toolkit for evaluating language agents across offense, defense, and cybersecurity knowledge-based tasks. DefenderBench includes environments for network intrusion, malicious content detection, code vulnerability analysis, and cybersecurity knowledge assessment. It is intentionally designed to be affordable and easily accessible for researchers while providing fair and rigorous assessment. We benchmark several state-of-the-art (SoTA) and popular LLMs, including both open- and closed-weight models, using a standardized agentic framework. Our results show that Claude-3.7-sonnet performs best with a DefenderBench score of 81.65, followed by Claude-3.7-sonnet-think with 78.40, while the best open-weight model, Llama 3.3 70B, is not far behind with a DefenderBench score of 71.81. DefenderBench's modular design allows seamless integration of custom LLMs and tasks, promoting reproducibility and fair comparisons. An anonymized version of DefenderBench is available at https://github.com/microsoft/DefenderBench.

DefenderBench: A Toolkit for Evaluating Language Agents in Cybersecurity Environments

Evaluating the creative capabilities of large language models (LLMs) often requires human assessments that are difficult to scale, and previous studies have not focused on LLMs' capabilities to produce realistic social structures in storytelling. We introduce a novel, scalable methodology for evaluating LLM story generation by analyzing underlying social structures in narratives as signed character networks. In this study, we conduct a large-scale comparative analysis using networks from over 1,200 stories, generated by four leading LLMs and a human-written corpus. Our analysis of network properties like density, clustering, and signed edge weights shows that LLM-generated stories consistently exhibit a strong bias toward tightly-knit, positive relationships, which aligns with findings from prior research using human assessment. Our proposed approach provides a valuable tool for understanding limitations and tendencies in the storytelling of current and future LLMs and is also applicable to the setting of interactive narratives.

Evaluating LLM Story Generation through Large-scale Network Analysis of Social Structures

Simulating interactive world models remains a core challenge in Large Language Models(LLMs). In this work, we introduce the ByteSized32Refactored, a refactored, modular, and extensible implementation of the original ByteSized32 corpus to explore the task of text game generation. We further optimize the code structure of each text game and create the GameBasic.py foundation library, which centralizes common logic across all 32 games by abstracting 7 base classes (GameObject, etc.) into reusable modules, thereby reducing from 20k to 10k total lines of Python code compared to the original Bytesized32. Our refactored implementation enables extendability - with our centralized design, ByteSized32Refactored can be more efficiently extended to include text games of new scenarios and specifications by reusing the shared logic and functionalities. Extensive experiments with GPT-4o demonstrate a mix of performance - with Bytesized32Refactored, the generated text games for unseen scenarios showcase quality improvements on two of the four evaluation dimensions while decreases on the other two, indicating that the hierarchical structure of the refactored code presents new challenges for LLMs. Overall, we highlight that our extensible code structure, centered on the foundation library and the modular optimization, not only facilitates LLM adaptation to environment specifications but also establishes a scalable environment that supports future extensions.

ByteSized32Refactored: Towards an Extensible Interactive Text Games Corpus for LLM World Modeling and Evaluation

In the rapidly expanding streaming media landscape, engaging Promotional Introduction Texts (PIT) are essential for attracting viewers to various forms of media arts, such as movies and comics. Traditionally, these texts are manually written, leading to inconsistencies in quality and higher production costs. This paper addresses these challenges by proposing an end-to-end framework for automatically generating attractive PITs directly from storylines. However, currently, there is insufficient data and a lack of evaluation methods specifically designed for PIT generation. We constructed a dataset of 263 storylines extracted from Japanese media arts and their associated PITs. Using the dataset, We evaluated generations of six large language models by manual evaluation and automated evaluation (GPT-4) on attractiveness, consistency, and quality. Results demonstrated that there are trade-offs between generating attractive texts and maintaining the storyline, and achieving both objectives at the same time is a challenging task. We also find that there is a significant gap between automatic evaluation and human evaluation.

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