Iron Marines+ Mission 9 Guide: How to Beat the Stage With Guiying

To beat Mission 9 in Iron Marines+ using Guiying, fortify the central lane intersection immediately with stationary turrets and treat Guiying as a mobile hit-and-run assassin. Her low durability prevents her from tanking enemy swarms directly, but her burst dash allows her to eliminate backline threats and respond rapidly to split attack paths.

Guiying's Combat Role and Target Priorities

Guiying excels at eliminating priority targets rather than holding ground against swarms. Placing her directly in the path of incoming melee waves quickly drains her health and triggers her revive cooldown, leaving your base vulnerable.

• Positioning: Station Guiying behind frontline infantry or inside side corridors near your defensive perimeter. Pull her back into turret range whenever her shields break so her passive regeneration can restore her health.
• Target Selection: Use her dash and burst damage to bypass front-line fodder. Direct her attacks toward ranged acid spitters, support casters, and heavy summoners.
• Flanking Elites: When heavily armored Fell brutes appear, let turrets or infantry draw aggro first. Move Guiying behind the target to deal burst damage without taking counterattacks.

Defensive Placement at the Central Crossroads

Mission 9 features intersecting paths where Fell forces converge before splitting toward your base. Securing the central crossroads prevents enemies from bypassing your mobile units and attacking the Command Center directly.

Build a Gatling or Tesla turret at the first junction as soon as the opening wave falls. Upgrading this position anchors your line, allowing your strike squad to push outward without leaving the base exposed.

Ether Management Across Wave Phases

Avoid floating unspent Ether. Invest spare resources into squad conversions, turret upgrades, or drop pods as soon as a wave is contained.

• Early Game (Waves 1–3): Maintain a squad of upgraded Combat Marines and establish your first perimeter turret. Keep Guiying nearby to clear initial clusters.
• Mid Game (Waves 4–6): Secure the secondary Ether drop. Convert one squad into Snipers to manage armored units, and add Tesla or Missile upgrades to the central hub.
• Late Game (Final Waves): Add Brawlers or Guardians to shield your Snipers. Keep Guiying free to reinforce whichever lane faces the highest sudden pressure.

Step-by-Step Mission Route

Clear the map methodically in phases to avoid triggering multiple enemy nests at the same time.

1. Clear the Initial Drop Zone: Eliminate nearby nests using Guiying's burst abilities. Do not advance down diverging lanes until your primary turret foundation is active.
2. Secure the Northern Flank: Move your squad north toward the first auxiliary Ether node. Station Guiying between the squad and the central crossroads so she can sprint back if the southern approach is threatened.
3. Fortify the Crossroads: Push into the convergence point, clear entrenched burrowers, and construct a secondary defense point. This establishes a forward staging area for the final push.
4. Destroy the Brood Nests: Advance toward the primary enemy cluster behind your frontline infantry or defensive drones. Send Guiying directly into the main spawners to destroy them before elite bio-forms can overwhelm your army.