Puzzles & Survival: Campaign 2-1 Barrel Run Walkthrough

To clear Campaign 2-1 Barrel Run in Puzzles & Survival, release your barrels down specific ramp tracks only after zombie groups reach designated track markers and bottleneck junctions. Conserving your limited barrel supply across all three waves prevents enemies from reaching your perimeter gate.

Campaign 2-1 Wave Breakdown

Each wave requires targeting specific ramps while factoring in the 1- to 2-second travel delay as barrels roll down the scaffolding.

Wave	Enemy Composition	Target Track	Release Timing Cue
Wave 1	Two standard walkers in left lane	Left upper ramp	Release when the lead walker reaches the support strut at the ramp's midpoint.
Wave 2	One fast runner on right, two walkers on left	Right ramp, then left ramp	Drop the right barrel first, then drop the left barrel roughly 1.5 seconds later.
Wave 3	Dense cluster mixed with fast runners	Central main incline	Drop the first barrel as the pack enters the junction; drop the second barrel two seconds later.

Step-by-Step Stage Walkthrough

Wave 1: The Opening Walkers

Two slow-moving walkers enter along the left lane. Do not drop a barrel the moment they spawn. Wait until the front walker crosses the wooden support strut at the midpoint of the upper ramp. Releasing the left barrel at this marker gives it enough downward momentum to roll through and crush both walkers in sequence.

Wave 2: The Split Mid-Wave

Enemies advance down both sides of the scaffolding simultaneously. The right lane contains a single fast runner, while the left lane contains two standard walkers.

Release the right-hand barrel first. The right ramp has a steeper incline, allowing the barrel to reach high speed and eliminate the runner before it crosses the bottom junction.
Shift immediately to the left side and release the left-track barrel approximately 1.5 seconds after the first drop. This clears the slower walkers trailing behind.

Wave 3: The Final Swarm

The final wave sends a concentrated group toward your base gate. A single barrel will not eliminate the entire group.

Hold your fire until the pack bunches together at the main bottleneck junction.
Drop the primary center barrel into the cluster to wipe out the front line.
Drop a second center barrel roughly two seconds after the first. This backup roll crushes trailing walkers and any fast runners that slipped past the initial blast.

Core Barrel Run Rules and Timing

Managing the environmental physics is essential to avoid failing the stage:

Barrels cannot reverse direction: Once triggered, barrels roll along fixed tracks and gain speed on downward slopes until they hit targets, detonate, or exit the combat area.
Hitboxes pierce lines: Barrels do not stop on the first target; they roll through small lines of walkers before breaking or exploding.
Lead your targets: Barrels require one to two seconds to travel from the top release point to the lower junctions. Releasing only after a zombie reaches a kill zone will cause the barrel to miss behind the target.
Avoid panic tapping: Emptying your barrel rack early leaves the gate undefended against the late-wave runners.

Next Progression Steps

Clearing Campaign 2-1 awards account experience and Sanctuary building resources. After completing the stage:

Collect the chapter milestone rewards from the campaign menu.
Return to your Sanctuary to invest the rewarded resources into upgrading your primary headquarters and training facilities.
Proceed to Campaign 2-2 to continue unlocking progression rewards without spending world map stamina.