Real fluid physics. No mop required.
The bottle is a rigid shell with a cap; the water is a set of particles coupled to it through momentum-conserving contacts, so the spin really does slow as the water shifts, and the landing really is cushioned by the slosh. Fixed time step, no randomness, and its own bit-exact sine and cosine, so the same settings give the same flip in every browser.
Scoring starts at 100 for the reference flip (the defaults with spin eased back to 3.4) and climbs steeply the less wiggle room your settings leave: after a landing the lab nudges every setting until the flip turns into a flop, and the tightest tolerance sets the multiplier. Fast spins, lanky bottles, fill away from a third, high drops, speed, trampoline or ice, landing on the cap, and higher levels all multiply it further.
Land your first flip and a ten-level ladder appears; each level you clear unlocks the next. Positive spin sends the cap backwards (a normal flip). Long-press any setting, or the Surface heading, and the lab dials it to the nearest value that lands. Space bar flips.
Got a flip code from a friend? Paste it here.
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