Archer Castle Unit Merging and Board Management Guide

To maintain your defense against incoming enemy waves in Archer Castle, combine identical archers on your grid to synthesize higher-tier units. Dragging one archer onto another unit of the same level creates a single, higher-level defender with increased base stats. Merging keeps your active board clear so you can continue spending gold to summon fresh reinforcements.

Board Space and Unit Synthesis

Each board slot represents active defensive potential, but unmerged low-tier units quickly fill the grid and create a deployment bottleneck. When your grid reaches maximum capacity, you cannot summon new archers from your reserve pool.

Action	Practical Effect	Key Operational Limit
Grid Merging	Combines matching units into a higher-tier archer occupying one tile.	Requires two identical-level units on the board.
Reserve Storage	Holds unmatched archers off the active board until a pair spawns.	Slots are limited; avoid hoarding too many unassigned tiers.
Gold Summoning	Spawns new units onto open grid spaces to feed unit synthesis.	Costs gold; ineffective if the board is completely full.

Prioritize clearing vertical and horizontal grid space before spending gold on additional summons. If your reserve slots fill up with single units waiting for matches, pause summoning until matching pairs appear naturally on the main grid.

Firing Line Positioning

Once archers are merged into higher tiers, position them to maximize damage efficiency:

Central Columns and Front Rows: Place your highest-level merged archers in front or center positions to ensure maximum coverage across multiple lanes.
Target Concentration: Group strong units close together so their projectiles strike the same incoming enemies, helping take down tanky foes quickly.
Lane Reactive Adjustments: Shift high-tier units toward lanes receiving heavy enemy pressure during aggressive waves.

Managing Gold and Summon Limits

Summoning units requires gold, making resource management directly tied to your merge frequency. Spending all your gold immediately to fill the board leaves no buffer if an enemy line breaks through. Keep a reserve of gold available to perform emergency summons when dealing with faster or stronger wave transitions.

Because unit summons rely on random spawning, you cannot force specific merges. If a required match does not drop, keep a mix of mid-tier and high-tier defenders across your board rather than banking entirely on a single high-level archer. Over-relying on one unit creates defensive gaps whenever that archer targets a low-priority enemy.