Against the Gradient is a game where you use the principles of cellular transport (facilitated diffusion, active transport, etc) to solve puzzles.
Sixteen transporters! Including real proteins found in your body and imaginative nano-robots that really challenge your understanding of cellular transport.
Over 20 puzzles ranging from a gentle introduction to the principles of cellular transport to extemely challening mind benders!
If you really think you understand how transporters diffuse molecules and ions across the membrane, try making your own puzzles with the built in level editor!