Caffeine Rush

defend the receptors

— coffees refilled

Caffeine receptor defense game with character molecules and clear sleep countdown

Score 0 Day 1 Level 1
Alert
Caffeine receptor defense playfield Click empty receptors to dock caffeine before adenosine arrives. Avoid more than half being adenosine-blocked for 5 seconds. Adenosine drifting in Neuron membrane
Falling asleep in 5.0s
Level 2
Afternoon slump

You fell asleep
Reached level 1 with score 0
Top scores
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5 / 8
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How caffeine actually works

While you're awake, your brain produces a molecule called adenosine. It slowly builds up and binds to receptors that signal "you're tired." Caffeine has a shape similar enough to adenosine that it can dock at the same receptors first, blocking adenosine from binding. You don't actually feel more energized — you just feel less tired. Eventually adenosine wins, the caffeine wears off, and you crash. Hence: another cup.

How to play