Cells are healthy (0), infected (1..n−1) or ill (n). Healthy cells catch infection from infected and ill neighbours. Infected cells average their neighbourhood and add g. Ill cells recover.
Tap to make a patch ill. The same ?seed= always gives the same run.
LITThe Gerhardt–Schuster hodgepodge machine (1989). States must stay within 0..n, or the page throws.
WALLA cellular cartoon, not BZ chemistry.