“…Some of these activity-trackers might largely adhere to our description of interactive play systems and future systems might even fall within the domain. Nonetheless, they are forming a quite different area of research as many only provide 'feedback' before or afterwards [170], are less playful, and do not contain the earlier mentioned gradual ways of input and output. 1 Immersive environments (stimulating play) around a narrative can be seen as some of the first systems [68], including the well known Kidsroom [31] 2 Stach et al, based on analyses of 107 active games, proposed 6 forms of input: gesture, stance, point, power, continuous control (including position), and tap.…”