Pen the Flock
JezzBall, with sheep. Build fences across the field to box the flock into smaller and smaller pens. Any ground you close off with no sheep in it turns to pasture. Clear 75% of the field to move on.
- Click to start a fence. It grows both ways until it hits a fence or the edge.
- Right-click or press Space to switch between across and up-and-down. On a phone, use the button.
- A sheep that runs into a fence while it's still growing breaks that half, and you lose a life.
- Take too long and the wolf comes for your fences. Level n has n + 1 sheep.
The Daily run is the same field and the same flock for everyone today (Mon, Nov 2); your best run of the day counts.
You can play as a guest. Sign in to save scores, earn badges and keep replays.
The flock
-
From level 1Lamb
Bounces corner to corner. Your bread and butter.
-
From level 3Ram
Quicker, and every so often it charges in a straight line.
-
From level 4Big woolly ewe
Big and slow. Bump her with a growing fence and it holds, but she splits into two lambs.
-
From level 5Black sheep
Chews through finished fences if it keeps bumping the same spot.
-
From level 7Ghost lamb
Fades out every few seconds, and walks right through growing fences while it does.
-
If you dawdleThe wolf
Shows up after a while and makes for any fence you're growing. Fence it into a pen with no sheep for a big bonus.
Power-ups
They turn up in open ground. Fence one in, or close it into pasture, and it's yours.
- Sheepdog
For 8 seconds sheep (and wolves) bounce off your growing fence instead of breaking it.
- Nap time
Every sheep and wolf falls asleep for 3 seconds.
- Iron fence
Your next fence can't be broken, and the black sheep can't chew it.
- Extra life
One more life for this level.
- Wolf repellent
Sends any wolf home and holds the next one off for 30 seconds.
Scoring
10 points an acre you capture, times the level. Capture again within 3 seconds for a chain (×1.5, ×2, ×2.5…). 15% of the field in one go is a big pasture (+50%). A sheep penned alone in 32 acres or less: 250 × level. A wolf in a box: 1,000 × level. Finishing a level adds 100 × level for each life left, 20 × level for every acre past 75%, and 10 × level for each second before the wolf.
Leaderboards badges & Firsts →
Endless each player's best
No finished runs yet. Be the first.
Today's Daily Mon, Nov 2
Nobody has finished today's daily yet.
Daily champions last 7 days
| Day | Winner | Score | Players |
|---|---|---|---|
| Tue, Oct 27 | Ty Lamb | 274,365 | 1 |
Latest Firsts hall of fame →
| First | Reached level 9 | Ty Lamb |
| First | Reached level 8 | Ty Lamb |
| First | Reached level 7 | Ty Lamb |
| First | Reached level 6 | Ty Lamb |
| First | Reached level 5 | Ty Lamb |
Recent runs
1 runs by 1 player so far: 4,015 acres cleared and 45 sheep penned.
| Player | Mode | Score | Level | |
|---|---|---|---|---|
| Ty Lamb | Daily, Tue, Oct 27 | 274,365 | 9 | Watch replay |
How it's built
The rules are one file, engine.js, that runs both in your browser and on the server. It only does whole-number maths on a fixed 60-steps-a-second clock with a seeded random generator, so the same seed and the same clicks always play out the same way, on any browser. That means a whole run is stored as just the seed plus a list of clicks: a few kilobytes for an hour of play. When you finish, the server re-plays your clicks itself and keeps its own score, so the leaderboard can't be fed a made-up number. Replays are the same trick played back on your screen.