Dome Keeper Swiss Cheese Challenge Mode Guide

To survive the Swiss Cheese challenge mode in Dome Keeper, prioritize jetpack mobility and carry capacity over early drilling power. The Swiss Cheese modifier alters map generation by riddling the subterranean bedrock with pre-existing open caverns from the top tier down to the deepest layers. While these hollow pockets leave iron, cobalt, and water deposits directly exposed along cavern walls, the lack of solid ground disrupts standard vertical drop shafts and severely slows heavy resource hauling.

The pre-hollowed terrain removes the need for rigid two-tile strip-mining grids, changing early exploration into a hauling and routing challenge:

Gather exposed veins first: Scout the perimeter walls, ceilings, and floors of each newly discovered chamber. Natural pockets expose mineral deposits without requiring deep drilling.
Carve transit ledges: Create single-block steps or ramps along cavern walls rather than floating across wide, empty drops with heavy ore bundles.
Maintain a central transit line: Keep a clear, unobstructed path directly below the dome to prevent getting snagged on cavern ceilings during defensive ascents.
Prevent dropped cargo: Avoid dropping clusters of iron or cobalt into unexplored vertical chasms, as retrieving them without high-tier jetpack upgrades costs valuable defensive preparation time.

Upgrade Priorities

Because natural air pockets reduce the amount of solid rock you must break to locate resources, invest your earliest iron hauls into movement and carry capacity rather than higher drill tiers.

Upgrade	Priority	Strategic Role in Swiss Cheese
Jetpack Speed	High	Crosses wide cavern gaps quickly between combat waves.
Carry Capacity	High	Prevents movement penalties when hauling ore across floorless drops.
Drill Tier 1	Moderate	Breaches harder rock barriers dividing separate cavern networks.
Drill Tier 2	Low to Mid	Can be delayed while exposed minerals remain readily accessible.
Dome Defense	Urgent	Keeps pace with escalating waves of flying, ranged, and ground monsters.

Delaying the second drill upgrade allows you to route iron directly into keeper speed, carry strength, and defensive weapon damage without falling behind on resource acquisition.

Combat Timing and Dome Defense

Irregular terrain increases transit times back to the dome, making return timing much tighter than in standard runs:

Ascend immediately on warning: Start flying back to the weapon console the moment the wave warning flashes. Navigating irregular ceiling overhangs takes longer than flying up a straight vertical shaft.
Upgrade weapon tracking speed: Rapidly swinging the primary laser between incoming flanks prevents wasted defensive uptime.
Prioritize threats in combat: Target fast flying monsters and ranged spitters first to eliminate incoming damage before focusing on slow, heavy ground targets.
Reserve cobalt for repairs: Avoid spending cobalt on early utility upgrades; hold it in reserve to repair structural dome damage during multi-wave attacks.
Bridge gaps with gadgets: If you recover mobility relics like the Lift or Teleporter, install them directly across the widest cavern drops beneath the dome to automate ore transit.