What if every moment of play could also be a measurement? A game in augmented reality, a virtual scene for practising social cues, a toy that responds to how a child plays: each can train attention, social skills or emotion recognition, and each can record gaze, movement, choices and physiology along the way, so clinicians see more than a final score and can tailor the next session. Headsets with built-in eye tracking, language-model characters and sensor-equipped toys are within reach for a two-day build, together with a plan to test the best idea with patients. Worth a first look: augmented-reality cues for attention after stroke.