  Accurately quantifying player experience is challenging for many reasons:
identifying a ground truth and building validated and reliable scales are both
challenging tasks; on top of that, empirical results are often moderated by
individual factors. In this article, we present a study on the rogue-like game
Hades designed to investigate the impact of individual differences in the
operationalisation of player experience by cross-referencing multiple
modalities (i.e., questionnaires, gameplay, and heart rate) and identifying the
interplay between their scales.
