Leave your land, draw a loop and get back home: everything inside it becomes yours. Cut someone's trail to knock them out and take all their land. If anyone cuts yours first, you're out.
Up to 12 people play at once, and bots take the other seats. From half full the arena keeps fewer players: 11 at 50%, 10 at 60%, 9 at 70% and 8 at 80%. Bots give up their seats, so people always come back, until 85%: then nobody does and the last one standing wins.
Steer with the mouse, by dragging a finger anywhere, or with the arrow keys.