Integrate-and-fire neurons on a grid get random drops of charge. A neuron that crosses threshold fires, resets, and gives charge w to its 8 neighbours, which can fire in the same instant.
Tap a neuron to fire it. The same ?seed= always gives the same run.
LITOlami–Feder–Christensen-style avalanches; Beggs & Plenz saw scale-free bursts in cortex (2003). Potentials must stay in range, or the page throws.
AMBERNear-critical coupling is set by the seed, not tuned by the network.