Dome Keeper: How to Beat the Iron Shortage Challenge Mode

To beat the Iron Shortage challenge mode in Dome Keeper, spend your first iron deposit on the Tier 1 Drill upgrade, space your vertical mining shafts exactly two blocks apart, and rely on gadget chambers and secondary resources to offset small deposit yields. Because veins only produce two to four iron pieces, luxury convenience upgrades will leave you underpowered for combat waves.

Early Shaft Layout and Exploration Route

Standard strip-mining wastes time and Jetpack stamina on empty rock. Because iron is scarce, your excavation pattern must reveal the maximum number of blocks with the fewest possible hits.

Dig two-block vertical shafts: Dig single-tile vertical shafts leaving two solid blocks between each corridor. This reveals hidden blocks on both sides without destroying empty stone.
Path toward gadget chambers: Steer toward the distinctive outlines of gadget rooms as soon as they appear. Free utility from gadgets offsets the lack of iron-based dome enhancements.
Haul on every ascent: Never fly back to the dome empty-handed. Haul whatever water droplets or small iron scraps you uncover to match the combat wave timer.
Avoid early horizontal clearing: Do not carve out wide horizontal caverns until you locate a gadget or relic chamber. Wide rooms burn digging cycles and risk stranding you underground during an alien assault.

Iron Allocation and Upgrade Priorities

You must allocate iron to digging speed and weapon lethality before purchasing quality-of-life perks. Spend your first four to eight iron exclusively on Tier 1 Drill to maintain mining speed through denser lower rock layers.

Upgrade	Priority Timing	Purpose in Iron Shortage
Tier 1 Drill	Immediate (First 4–8 Iron)	Prevents hard stone from stalling excavation cycles.
Primary Weapon Damage	Waves 3–5	Decreases time-to-kill against armored ground and aerial threats.
Tier 1 Carry Capacity	After Drill and Weapon	Reduces hauling trips once basic combat thresholds are met.
Jetpack Speed	Low priority	Skip early by keeping shafts narrow and direct.
Dome Hull Repair	Emergency only	Iron spent patching damage diverts resources from permanent combat scaling.

Avoid buying movement speed and carry capacity at the same time. While baseline transport is slow, insufficient weapon damage or an unupgraded drill will end the run much faster than slow transit times.

Combat Target Priority Under Minimal Upgrades

Operating with base or low-tier dome weapons—such as the standard Laser or Sword—requires strict target prioritization during attack waves:

Ranged attackers: Eliminate distant ranged units first. Their continuous projectile damage quickly forces costly dome repairs.
Aerial swarms: Intercept flying units along their incoming flight paths before they disperse across the dome's perimeter.
Melee ground units: Time attacks against ground enemies right before their strike animations connect, minimizing the window they spend hitting the dome shield.

Avoid spending iron on proactive dome health repairs. Every point of iron spent patching minor damage delays defensive damage scaling or your Tier 2 Drill.

Offsetting Scarcity with Secondary Resources and Gadgets

Water and cobalt become critical tools for surviving without standard iron reserves.

Water allocation: Use uncovered water to run utility gadgets and dome overcharge mechanics rather than buying mechanical stat upgrades.
Cobalt management: Reserve cobalt strictly for critical hull repairs rather than minor top-offs.
Relic and chamber gadgets: Prioritize gadgets that replace iron upgrade branches. A Lift or Teleporter eliminates the need for Jetpack and carry upgrades, a Condenser provides steady water generation, and a Stun Laser or Blast Mining module delivers crowd control and excavation without iron investment.