Drop Duchy Board Guide: How to Clear Enemies and Grid Space

In Drop Duchy, eliminate hostile mobs by placing unit tiles adjacent to enemy slots or completing line clears across the grid. Because the game lacks a direct attack button, enemy removal is tied directly to construction patterns. Your immediate priority during a crowded run is to clear central tiles first, dedicating roughly 30% of your total turns strictly to defensive clears to keep grid space open.

How Combat and Tile Placement Work

Enemies in Drop Duchy occupy physical grid slots, directly restricting where you can place new building and resource tiles. If enemies accumulate faster than you can clear them, available space shrinks until no valid placements remain, causing a game over.

To clear enemies from the board:

1. Target Adjacent Slots: Position unit tiles next to active hostile mobs to activate clearing effects upon placement.
2. Complete Line Clears: Align tiles into completed rows or columns. Any enemy caught within a completed line clear is wiped off the board, instantly reopening those slots for construction.
3. Plan Ahead: Check your upcoming tile queue to line up proximity matches before hostile units completely seal off viable placement paths.

Prioritizing Central Grid Density

Grid overcrowding is the primary failure condition in long runs. Enemies located along the edges of the board reduce your total grid space, but enemies in the center are significantly more dangerous because they split your building area into disconnected, unmanageable sections.

When choosing where to clear hostiles, focus on the following priorities:

• Clear the Center First: Maintain a connected open area in the middle of the board so you retain maximum flexibility for large tile chains.
• Leave Edge Mobs Temporarily: Mobs isolated on the outer edges consume space, but they rarely block overall building paths as severely as central clusters.
• Check Movement Boundaries: Before placing high-value structures, ensure your placement will not cut off your access to remaining open spaces.

Board Management Rules and Strategy

Balancing structural growth against enemy removal requires deliberate placement choices rather than chasing high scores early in a run.

• Follow the 70/30 Split: Dedicate roughly 70% of your moves to constructing resource chains and 30% strictly to targeting high-density enemy clusters.
• Use Double-Duty Placements: Seek proximity placements that complete a resource match while simultaneously removing an adjacent enemy or triggering a line clear.
• Hold High-Clearing Tiles in Reserve: Save tiles with powerful grid-clearing potential for emergency situations when the board becomes cluttered, rather than using them immediately for minor point increases.

Adapting to Shifting Mobs and Hazards

Later stages introduce complex enemy types that may resist single line clears or require specific matching patterns to remove. When new hostiles drop onto your board, pause to observe their placement behavior. If mobs begin to cluster, hold off on small single-tile clears and construct a larger chain reaction to wipe out multiple hazards in a single turn.