/play/eco — Ecosystem
A living predator-prey meadow. Grass grows, rabbits graze and breed, foxes hunt. Pick a map size, tune the sliders and watch the populations boom, crash and settle — or paint the world directly: drop in rabbits and foxes, sow grass, scorch it, or carve out water to make rivers, islands and pens the animals cannot cross.
Day
0
Rabbits
0
Foxes
0
Grass
0%
Pick a brush and click the meadow to intervene.
Map size (starts a new world):
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There is no winning — it is a sandbox. The default meadow settles into a stable balance; nudge a slider and it tips into a rabbit plague, a fox boom-and-bust, or a die-off. Water is impassable, so a river or a ring of it splits the map into islands and pens — herd the foxes onto one shore and watch the rabbits thrive on the other. Larger maps hold proportionally more of everything. Your longest run where both species coexist is remembered.