The one-loop rule
Farm the highest wave band you can finish comfortably. Faster, safer clears beat risky deep runs for income per hour.
Define the stop condition before repeating.
Build and Kill Zombies Farming Basics
Clear the highest wave band you can finish, kill everything the build reaches, and reinvest each payout into clear speed.
Choose the target
Separate farming lanes by outcome
A farm needs a measurement and a stop rule.
Kills are income
Every zombie your build reaches pays. Coverage — how much of the wave you can kill — matters as much as raw damage.
Define the stop condition before repeating.
Reinvest immediately
Cash sitting idle is progress lost. Spend payouts on clear-speed upgrades between runs.
Define the stop condition before repeating.
Repeatable loop
Run the session in order
- 1
1. Pick your farming band
Choose the highest wave band you finish without dying — that is your income floor.
- 2
2. Maximize kill coverage
Position defenses so zombies funnel into weapon range; more kills per wave means more cash.
- 3
3. Upgrade clear speed
Buy the damage upgrades that shorten each run first — speed compounds into income.
- 4
4. Step the band up
Once clears feel easy, move one band higher and repeat the loop.
- 5
5. Sanity-check with the tool
Use the cash calculator to compare your estimated income against upgrade prices.
Stop rules
Leave a bad farming loop
Deep runs for farming
Farming is a repeat loop; record attempts belong to progression, not income sessions.
Hoarding cash
Unspent cash does nothing between runs — reinvest in clear speed first.
Trusting unofficial rate claims
The game publishes no official cash rates; treat any exact numbers elsewhere as estimates.
All guides
Back to the full guide library.
Cash Farming Guide (full)
The complete farming walkthrough with stuck-state fixes.
Cash Calculator
Estimate earnings per run before upgrading.
Codes Status
Check reported codes before a long session.