You are one spermatozoon among hundreds. Swim from the vagina, through the cervix and uterus, up the Fallopian tube — and reach the ovum first. Dodge acid and white blood cells, shove your rivals aside, and learn every organ on the way.
Mouse — steerMove the cursor away from screen centre to swim that way. Arrow keys / A D also work.
W / Left-click — swim hardBurns ATP. Let go to recharge. Grab glowing fructose for a refill.
Space / Right-click — ramA short, violent dash that stuns and hurts anything it hits. Cooldown applies.
Medicine incomingPills and capsules tumble down the tract at you. Dodge them — or ram-dash to smash them. Avoid blue spermicide gel and the copper IUD.
Power-ups & tricksCyan caffeine tablet = turbo. Green antioxidant capsule = shield. Slipstream behind rivals; chain rams for combos.
Hazards & winningAcid, neutrophils, mucus, contractions. First sperm to touch the egg wins. Press Tab any time for the anatomy guide.