Sensemitter is now Emhance.
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This guide draws on 70+ emotion playtesting studies across four game genres — covering what facial coding and biometric signal research reveals about player engagement, FTUE drop-off, reward design, and the mechanics that drive or destroy retention. The same patterns appear repeatedly: engagement built on dopamine loops, agency lost when mechanics become obligations, frustration ceilings no reward can undo. Real players, real data, actionable findings.
Most playtesting tells you what players do. Emotion playtesting tells you what they feel — and the gap between the two is where retention is won or lost.
This report brings together findings from 70+ emotion playtesting studies across four casual game genres. Using facial coding and behavioural signal analysis, we tracked the exact moments players engaged, disengaged, felt frustrated, and felt rewarded — across FTUE, core loops, monetisation offers, and reward delivery.
What emerged is a set of patterns that cut across genre. Players disengage after the second consecutive failure, not the first. Rewards land flat when the outcome was already certain. Ads reduce engagement — and the damage outlasts the ad itself. Passive sequences, obligation mechanics, and misaligned archetypes erode retention in ways that standard playtesting cannot surface.
The guide is structured around those patterns: what causes them, when they appear, and what to do about them. Whether you are optimising an existing title or stress-testing a new one before launch, the framework here gives you a language for the emotional layer of your game — and the tools to measure it.