Used to analyse the Mechanics–Dynamics–Aesthetics chain in Supernaturally's vulnerability system. Identified the risk of the Inventory Fumble dynamic undermining the Challenge aesthetic, resolved through visual affordance design.

Applied as a fairness metric, specifically Attribution Theory to distinguish internal failure attribution ("I jumped too early") from external ("the system failed me"). Used to validate that the Hard-Lock vulnerability system preserved player Competence across all 11 test sessions.

Used alongside Hick's Law (decision latency), Cowan's working memory limit (4±1 chunks), and Fitts' Law (input ergonomics) to define and operationalise Cognitive-Mechanical Interference, the coupling fault between decision latency and committed movement.

Used to define the aesthetic target for high-difficulty platformer design, measuring whether tactical complexity pushed players into the Frustration zone or maintained the Challenge channel. Zero flow loss recorded across all variable-condition sessions.