Wind Tunnels vs Tippy Brim

Control the propellers and make your way to the finish!

Brimful — A one-tap physics game that puts the science of surface tension at your fingertips. HOW TO PLAY 1. Pick one of three liquids in Practice mode, or take on a hidden liquid in Challenge mode 2. Hold the faucet to fill the glass to the rim 3. The faucet swaps for a dropper once the cup is full 4. Tap to release single drops and grow the iridescent dome 5. Hit "I'M DONE!" to lock in your score — spill, and the score resets to zero TWO MODES ■ Practice — three liquids to master • Alcohol: weaker surface tension, smaller dome, fast-settling ripples. Beginner-friendly • Water: balanced standard • Syrup: stronger surface tension, taller dome, long-lasting ripples. Advanced ■ Challenge — 7 mystery liquids + random cup size • Viscosity, oscillation, and dome height change every round — drawn from 7 hidden variants • Cup size also rolls between XS / S / M / L / XL • Anti-repeat ensures no two consecutive rounds share the same liquid or cup size • Scoring is fair across configurations: bulge² × time multiplier × tap bonus THRILL • Past 70% bulge, random air currents start rocking the surface • Idle long enough and the cup may spill on its own • In the dropper phase, score decays 3% per second after a 3 s grace • Faster taps boost the tap-bonus multiplier (×0.7 to ×1.30) • Challenge scores above 2000 are masked as "????" — you only see the truth when you cash in VISUAL • Iridescent soap-bubble dome that catches pink, lavender, and peach light • Warm cream paper aesthetic with a glassy cup centerpiece • Custom physics engine renders the faucet, dropper, and droplets in real time • Meniscus clings to the rim, oscillates, and breaks with believable detail DESIGN • Tap and long-press only — no shaking, no tilting • Fully offline. No network access, no ads, no in-app purchases • Bilingual JP/EN with preference persisted across launches