The wave starts with the player spacecraft facing sideways with the barrier dartboard on the opposite side. A danger zone will appear at the back where chicken darts will be fired, aiming at the dartboard.
These chicken darts will “peek” at the screen first, just like the wave Exclusion Zone. Then they will then quickly dart themselves to the barrier dartboard.
The dartboad will be like this if you let all enemies go.
Free multikill/pecking stonks
Preferably, a fence can be added to prevent wave cheesing.