Prisoner of Words: Lessons Learnt from Mobile Gamification of Lab Memory Experiments

This analysis examines the challenges and opportunities of gamifying laboratory memory experiments for mobile platforms. The primary objective is to identify how standard game design elements—such as scoring systems, level progression, and input methods—can inadvertently introduce confounding variables that threaten the validity of psychological research. By replicating a known laboratory study on serial recall, the research provides a framework for balancing engagement with experimental rigor in naturalistic settings.

The study utilized a mobile game titled "Prisoner of Words," which was deployed over a two-week period to 44 participants across eight countries. The methodology involved transforming a laboratory experiment into a mobile format while maintaining the original word bank and task structure. The results successfully reproduced established psychological trends, specifically that participants recall shorter lists in forward order and longer lists in backward order. This validation confirms that mobile gamification can effectively support in-the-wild research, provided that design elements are carefully managed to avoid biasing participant behavior.

Key findings emphasize that competitive scoring and smart input features, such as autocomplete, can significantly interfere with memory performance by incentivizing artificial strategies or providing unintended cues. To mitigate these risks, the study recommends avoiding secondary rewardable actions, disabling predictive text, and using step-conditioning techniques to bundle experimental conditions within levels. By structuring levels to include multiple conditions, researchers can ensure that even partial participation yields viable data. Ultimately, the research demonstrates that interdisciplinary collaboration between psychologists and game designers is essential to create mobile tools that maintain scientific integrity while fostering user engagement in natural environments.