Circles and squares fall from the top of the play area. Tap circles before they exit at the bottom. Squares are decoys — tap one and you lose points. Reaction speed climbs; spawn rate rises. Sixty seconds of moving-target discipline.
The Science: A moving-target variant of the sustained-attention task family. Failure to inhibit responses in dynamic environments is one of the earliest cognitive markers of fatigue and sleep debt (Lim & Dinges, 2008).
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