R4 (start) - open office

R4 - R9 - P1 and P2 defend alley, P3 and P4 defend office

R10 - Open hotel and apartments. Everyone corner hotel chairs

R11 - R14 - P1 hotel, P2 apartments, P3 alley, P4 office

R15 - open power, roof top. Get armor/perks. Stair-kill inferno.

R16 - R19 - P1 alley, P2 power, P3 apartments, P4 hotel

R20 - Open garden and all corner hotel chairs

R21 - R26 - P1 alley, P2 power, P3 appartments, P4 hotel

R25 - make 2 corners, depending on where the bosses are. Try to stay on your P.

R27 - R30 - Everyone camp at apartments slab in a corner (near the sniper). P1 rush power station, P2, P3 and P4 rush hotel.

R30 - Get ammo, camp at apartments near the air slab. Make sure to mass-snipe the bosses!