Blue cubes fuel core progression, but hunting them in the wrong way wastes time and gear. The fastest, most consistent farms revolve around unlocking passive collection, building a repeatable route, and converting surplus tech into cubes when luck cooperates. Here’s a clean plan that works from early runs through tougher zones.

Unlock the cube backpack (passive collection)

There’s a blue, wiggling vendor in the warehouse zone, down in an underground cellar behind a locked gate. Buy the cube backpack (also referred to as a cube storage device) from him. When equipped, this pack automatically gathers blue cubes that spill from enemies as they die. It turns every fight into steady income with no extra inputs.

Tip: Keep the backpack on by default. You’ll bank cubes from incidental combat and won’t miss drops while repositioning or looting.

Low-risk baseline: wear it and just play

With the cube backpack equipped, even basic ducks drip a few cubes each. The curve here is about volume and survival. Clearing camps, responding to nearby gunfire, and extracting cleanly adds up to thousands over a session—enough to buy meaningful upgrades—without needing to tunnel on specific targets or volatile events.

This approach shines when you’re tasking or questing anyway. You avoid overcommitting to single high-variance fights, and you still see your cube total climb run after run.

Efficient early route: sewer → first map road, watch the alley

For a simple loop that scales well with modest gear, start from the sewer and farm the road section on the first map. If the big white duck spawns in the alley, prioritize that engagement—it yields a strong bump in cubes.

  • Targets to prioritize: the big white duck (if up), mercs, “potato,” and nearby ducks.
  • Once your pack feels full enough or armor is chewed up, exit at smoke to bank the haul.

This route balances density, sightlines, and safe extraction. It’s a solid rhythm: sweep, pick your fights, extract, repeat.

Chase higher-ranking enemies for bigger drops

Cubes scale with enemy difficulty. Harder or named ducks pay out more per kill than rank-and-file mobs. Two standouts worth diverting for when they’re within reach are Man of Light and Pato Chapo. If your kit and meds are in a good place, string boss runs together—especially on compact zones like Farm Town—to spike your cube intake fast.

Note: Boss-hunting works best when you can armor up, carry proper ammo, and keep a med cushion. The risk is worth it only if you’re consistently extracting.

Mad Bombers drop cubes, but the risk is real

Mad Bombers are a direct source of blue cubes, yet they’re notorious for turning clean runs into instant losses. If you’re light on protection or still learning their patterns, they’re not the most efficient farm. The passive backpack method generally out-earns bomber grinding once you factor in wipes and re-entry time.

Convert JLab parts into cubes (disassembly)

Parts from JLab crates can be dismantled into blue cubes, letting you turn otherwise situational loot into guaranteed progress. One example worth highlighting: disassembling an Accelerator yields 15 units. If you’ve set up a disassembly station back at base, dump your crate tech there regularly to subsidize upgrades without taking extra combat risks.

Tip: Treat JLab parts as a cube bank. If you’re on a crafting path, keep what you truly need and break down the rest; otherwise, convert aggressively to accelerate unlocks.

Storm events and blue ghosts (advanced)

During storms, blue ghosts can be taken down for a separate “space crystal” path tied to the blue cube economy and merchant. This is a higher-skill, higher-attention option—use it when you’re confident with your route and loadout. It won’t replace the backpack grind for consistency, but it’s a potent supplement when conditions line up.

Blue cube farming methods at a glance

Method Setup required Yield profile Risk and notes
Passive kills with cube backpack Buy from blue vendor (warehouse zone cellar, locked gate); equip Steady, low per-kill; scales with encounters Lowest risk; works while questing and looting; extract often
Early loop: sewer → first map road Backpack equipped; learn alley spawn checks Consistent; spikes if big white duck spawns Clear sightlines; “smoke” extraction keeps runs short and safe
Boss and high-ranking duck hunts Solid armor, ammo, meds; route memory High per kill (e.g., Man of Light, Pato Chapo) Higher risk; profitable only with reliable extractions
Mad Bombers Anti-bomber readiness, patience Direct drops High wipe risk; inefficient if you die mid-run
Disassemble JLab crate parts Access to JLab crates; disassembly station at base Guaranteed conversion (e.g., Accelerator → 15 cubes) Great supplement; zero combat risk post-extraction
Storm blue ghosts Storm timing; combat readiness Yields space crystals tied to cube merchant Situational, higher skill; treat as bonus income

The quickest way to stabilize your blue cube income is simple: unlock the backpack early, keep it on every raid, and commit to a short, safe route you can repeat without drama. Layer in boss detours when you’re kitted, dismantle JLab parts as they come, and dip into storm events once you’re comfortable. That blend turns cubes from a bottleneck into a background resource that steadily funds your upgrades.