Get your sperm from the bottom strip into the eggs at the top: through five lanes of hostile traffic, then across the current by riding the logs. Fill all five eggs to clear the wave. Each crossing is on the clock, and you start with 3 lives.

Keyboard

Arrow keys (or WASD) hop one cell per press. P pauses, M toggles sound.

Touch

Use the D-pad in the corner - one hop per tap. The arrows button swaps which side it sits on.

Worth knowing

Water without a log under you is a drowning, riding off the edge is too, and the walls between eggs are walls. Landing an egg pays more the more clock you have left, and the glowing egg carries an oyster bonus while it shines. Every wave deals a fresh hand of enemies with faster lanes and a shorter clock. Watch for riders on the logs - lube and the blue pill are points, a heart is a life - and a lotion bottle on the median is an easy grab.