—We demonstrate PhysSigTK, a physiological signals toolkit for making low-cost hardware accessible in the Unity3D game development environment so that designers of affective games can experiment with how engagement can be captured in their games. Rather than proposing a context-free way of measuring engagement, we enable designers to test how affordable hardware could fit into the assessment of players’ states and progress in their particular game using a range of tools. Keywords—Physiological Signals; Game Design; Engagement; Physiological Sensors