Starguard: Evo Merge TD: Board Management and Merge Strategy Guide

To hold your defensive line in Starguard: Evo Merge TD, keep your board open by merging identical low-tier troopers during wave lulls, spending early currency on rapid summons to reach a critical unit mass, and reserving high-tier damage dealers for primary enemy paths.

Timing Synthesis and Board Space Management

Unit evolution relies on combining two identical troopers to produce a single, higher-tier unit. Because your grid has limited slots, keeping unmerged base units on the board prevents you from summoning reinforcements.

Merge during wave lulls: Avoid performing major merges while a heavy wave is actively moving down the lane. Synthesizing units mid-combat can briefly leave open gaps in your field of fire.
Keep open slots for summons: Always maintain empty grid positions. If your board fills completely with unmatchable units, your ability to spawn new units stops completely.
Position along main lanes: Place your highest-tier evolved troopers in locations where their coverage overlaps the primary path of invading forces.

Balancing Summon Costs and Upgrades

Managing your economy requires shifting your spending as the defense progresses. Early survival depends on filling the board with troopers, whereas later rounds demand high-tier quality.

Game Phase	Priority Action	Tactical Goal	Currency Usage
Early Game	Aggressive Summoning	Reach critical unit mass and spawn baseline troopers	High spend on new unit summons
Mid Game	Targeted Merging & Purging	Clear low-tier grid clutter and upgrade useful units	Balanced spend between summons and upgrades
Late Game	High-Tier Evolution	Focus firepower on heavy targets and build utility	Reserve currency for emergency summons and key upgrades

If your board becomes cluttered with single units that cannot be merged immediately, apply a "purge and upgrade" approach. Invest your currency into upgrading the active units that yield the highest damage or utility, freeing up grid efficiency while waiting for matching summons. Always maintain a small reserve of currency to buy quick replacements if enemies breach your forward lines.

Matching Unit Types to Enemy Waves

Adjust your board composition based on the incoming mechanical invader types:

Clustered Weak Enemies: Prioritize troopers that provide crowd control or splash damage to clear groups quickly.
Armored & High-Health Targets: Focus your synthesis efforts on creating concentrated single-target, high-tier troopers positioned to burst down individual threats before they reach the outpost.

Maintaining a diverse board composition ensures your grid is not countered by a single wave type. Focus synthesis on essential units for your overall build rather than randomly merging every available pair during active combat.