Send your strain. Drag from one of your cells to any cell your territory touches. Drag across several of your cells to send from all of them. Or tap a cell, then tap the target.
Marrow feeds you. The cell with the turning ring is marrow. Only cells joined to your marrow grow. Cut-off cells show stripes, dry out and go back to the body.
Every strain fights its own way. Virions swarm. Bacilli divide on long routes. Mycel roots the vessels it crosses, so you run fast there and enemies crawl. Phages eat whatever they meet in the vessels.
Genes. Pick three. Each one changes how your microbes fight, and you can see it on every one of them.
Read the tissue. Bone defends double. Fat holds 80. Units from nerve swim faster, units from muscle hit harder. A lymph node sends out white blood cells until someone takes it.
Blood runs one way. Watch the red cells in the vessels: going with the flow is faster. Hit a cell from two sides at once for a flank bonus.
Look closer. Scroll or pinch to zoom into the tissue, then drag an empty spot to move around.
Pipes. In Pipe mode a drag sets a standing line: that cell keeps pumping your strain along it. Tap it in Pipe mode to stop. Hold Shift to pipe without switching.