A microscopic world is in need of your help! Add transporters to membranes to move molecules and ions into and out of cells. Your goal is to reach specific concentrations. Over 20 unique puzzles will help you master the principles of cellular transport. Use channels, co-transporters, and antiporters to master facilitated diffusion and active transport. Think you understand how transporters diffuse molecules and ions across the membrane? Try making your own puzzles with the built in level editor! Features:Over 20 puzzles ranging from a gentle introduction to challenging mind