How to play

What you can do

• 
  Steer

  Drag left or right, tilt your phone, or press ← and →. You circle the inside of the tube.

• 
  Lunge

  Tap for a quick dash. Hold, then release, for a strong lunge that breaks membranes.

• 
  Full charge

  Keep holding until the ring turns gold. It fades after about 2 seconds, so let go in time.

In the tube

• 
  Pink membrane

  Hold the lunge and release when it says NOW. Too early and you bounce.

• 
  Gold-rimmed membrane

  Dark, with a thick gold rim: it only breaks with a full charge.

• 
  Fold

  Red tissue blocks part of the tube. Steer to the open side. Skim its edge for a speed burst.

• 
  Gold ring

  Fly through for a burst of speed. Not an obstacle: a gift.

• 
  Acid Surge

  Acid rises behind you. Rings and lunges keep you ahead of it.

Twists

Each run draws a surprise or two.

• 
  Macrophage

  A white blood cell hunts you. When its eye turns red, steer out of the red lane.

• 
  Traffic Jam

  Slow swimmers ahead. Weave past them; don't touch one.

• 
  Counter-current

  The flow pushes you back. Lunge to power through.

• 
  Mucus Fog

  You can't see far. Watch for what comes out of the fog.

• 
  Golden Sperm

  A rare, fast rival. Catch it for a rare title.

At the egg

• 
  Break the layers

  Circle the egg and lunge when a gold spot is right in front of you. Each layer takes several hits.

• 
  Rivals

  Rivals drill the egg too. Lunge straight into one to knock it off.

• 
  The seal

  If a rival breaks a layer first, the egg closes from its hole. Dash through before it seals.

• 
  The beat

  The inner zona opens only on its pulse: release as the gold plates flash.

• 
  Fusion

  Hold, and let go the moment the gold ring touches the egg.