L factorPlayer 1

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Lead by 2Equal concentrations.

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R factorPlayer 2

L factor’s turn

1 / 5 · Receive

Receptor blocked. One ligand clears it; a fresh ligand must make the journey to bind.

Drag from the glowing launch point toward your target, then release. Keyboard: arrows to aim and adjust force; Space to shoot.

Signal Rally

Choose your hormone. Send a signal through the bloodstream and make your cell respond. Secrete your factor to move the alien.

Drag toward your target and release to shoot. Roll and bounce around the bloodstream corner. Complete your pathway, then start it again. Lead by two secretions to win.

Hover, focus or tap a pathway molecule or arrow for its description. During play, use “Next move” and “Science lens”.