Specimen Sandbox — all 19, dropped at random

The rules — that's the whole game

Every cell looks at its 8 neighbours. All at once:

• Too few — fewer than 2 neighbours → it dies (lonely)
• Too many — more than 3 neighbours → it dies (crowded)
• Just right — 2 or 3 neighbours → it lives on
• Birth — an empty spot with exactly 3 neighbours → a new cell is born

That's it. From those four rules: ships fly, guns fire, patterns pulse forever.