Infiltration is the thirty-third offline mission and the thirty-sixth online mission in Earth Defense Force 2025 and the thirty-fourth offline mission and the thirty-seventh online mission in Earth Defense Force 4.1: The Shadow of New Despair.
Objective[]
2025: The Retiarius have invaded the buildings. The wing Divers launched an attack, but were forced to retreat. There are underground tunnels in the area and spider-like aliens have emerged from them. Nearby squads are hurrying to help. Support the Wing Divers.
4.1: THe Retiarii have invaded the business district! The Wing Divers launched a counter-offensive, but were forced to retreat as spider-like aliens emerged from underground tunnels in the area. Nearby squads are hurrying to help, but they may not be enough. Support the Wing Divers!
Storyline[]
Storm Team and a Ranger team arrives to the scene, when HQ tells them to rescue the people trapped in the webs. The soldiers can see a small park ahead with Retiarius webs, with Wing Divers trapped in them, between the surrounding buildings and three Tunnel Exits on top of it. The teams clear the area and the mission ends.
4.1 Changes[]
Storm Team now spawns from the other end of the park near the overpass. More enemies and more allies appear on the mission.
Enemies[]
2025[]
| Wave | Spawn | Enemy | Amount | Notes | |
| 1st | Appears at the begining of the mission. | Retiarius | 6 | ||
| Tunel Exits | 3 | ||||
| Spiders | 23 each | ||||
4.1[]
| Wave | Spawn | Enemy | Amount | Notes | |
| 1st | Appears at the begining of the mission. | Retiarius | 6 | ||
| Tunel Exits | 1 | ||||
| Spiders | 20 | ||||
| Tunel Exits | 1 | ||||
| Spiders | 8 | ||||
| Tunel Exits | 1 | ||||
| Spiders | 18 | ||||
Online Limits[]
Armor Limit
There's no limit for Inferno difficulty.
| Difficulty | Ranger & Air Raider | Wing Diver | Fencer | |||
| 2025 | 4.1 | 2025 | 4.1 | 2025 | 4.1 | |
| Easy & Normal | 813 | 808 | 456 | 454 | 1016 | 1010 |
| Hard | 2063 | 2242 | 1081 | 1171 | 2579 | 2803 |
| Hardest | 3376 | 4057 | 1738 | 2078 | 4220 | 5071 |
Weapon Level Limit
| Game | Easy & Normal | Hard | Hardest | Inferno |
| 2025 | 10 | 34 | 59 | - |
| 4.1 | 10 | 35 | 61 | - |
Approximate Weapon Drop Rate
| Game | Easy | Normal | Hard | Hardest | Inferno |
| 2025 | 3-7 | 5-9 | 19-31 | 1-56 | 8-68 |
| 4.1 | 2-7 | 4-9 | 20-35 | 0-57 | 8-68 |
Strategy[]
4.1[]
Bring weapons with high damage to destroy the Retiarii and the Tunnel Exits and weapons that can deal with a swarm of spiders.
It's best if you don't run into the middle unless you want to be shot by Retiarii from every direction. Kill the Retiarius closest to you then concentrate on the spiders and tunnels. When you are moving towards the farthest tunnel it's best if you kill the Retiatius on your side so you won't be shot from the back.
| 1-10 | Reconvene • Spreading Disaster • Winged War Goddess • Setting Sun • Wind Break • Underground Cave • Eruption • Retaliation • Beach Fear • The Return |
| 11-20 | Air Force • Day of the Demons • Takedown • Preventing Landfall • Land Collapse • Fortress Siege • Valley Shadows • Artillery • Breaking Through • Shining Stronghold |
| 21-30 | Into the Depths • A Trap • Giant Robots • Summit Ship • Anchored • Silver City • Crimson • High-Speed • Bloody Mountain • Brute Force |
| 31-40 | Charge Phase 1 • Charge Phase 2 • Dark Prisoner • Charge Phase 3 • Thunder • Infiltration • Convergence • Inferno • Starship • Dense |
| 41-50 | Crossing • Search • Waterside Bugs • Annihilation • Natural Calamity • Steel Beast • Void Ship • Blue Fighters • Earth Defenders • Fleet Attack |
| 51-60 | Mountain Pass Trap • Fortress Frenzy • Pincer • Ravages of War • Air Mobilization • Bug Invasion • Transport Ship Surprise Attack • Bug King • Crazy Skies • The Fleet Below |
| 61-70 | Bad Premonition • City of Horror • Mountains Ablaze • Breaking Through (2) • Bug Tower • Fortress Attack • Mountain Liberation • Sniper Attack • Mountain Giants • Towering Beast |
| 71-80 | Teeth of the Universe • Giant Ship • Spearhead • Tower Siege • Den of Thieves • Death Queen • Machine Squad • Monster Party • Labyrinth of Light • City Flaws |
| 81-90 | Monster Camp • Fallen Flagship • Heaven's Army • Encircling • Divine • The Threat • Troubled Valley • Battle to the Death • Massive Mobilization • Legion of Monsters |
| 91-94 | Scorching • Demon Army • Surrounded! • Star Eaters |
| DLC 1: Special Forces | Exploration • Giant's Advance • Silver Camp • Citadel • Floating Fleet |
| DLC 2: Mutant Rampage | Advance • Mountain Assault • Enemy Camp Infiltration • Underground Advance • Giant Robots • Battle Species • Beast Mountain • Dark Arena • Gathering Around • Armored Species • Iron Wall • Mountain of Change • Whirlwind of Death • Bugged City • The Tough • Golden Darkness • True King • Final Impact • Into Destruction • Ship of Dragons |
| DLC 3: Beyond Despair | Tracking • Underground Complex • Blocked Pass • Close Formation • Dragon Ship Fleet • Heavy Artillery • Bloody River • Dangerous Goldmines • Beast Mobilization • Total Protection • Aerial Bombing • King of Armor • Cannon Defenders • Traps Behind • Four Kings of Nightmares • Resistance Against the Twilight • Shivering Nexus • Three Giants • Crimson Lotus • Starry Prison |
| 1-10 | Reconvene • Spreading Disaster • Winged War Goddess • Setting Sun • Wind Shear • Underground Cave • Eruption • Retaliation • Beach Fear • The Return |
| 11-20 | Air Force • Day of the Demons • Takedown • Preventing Landfall • Land Collapse • Fortress Siege • Valley Shadows • Artillery • Breaking Through • Shining Stronghold |
| 21-30 | Into the Depths • A Trap • Giant Robots • Summit Ship • Anchored • Silver City • Crimson • Assault • High-Speed • Bloody Mountain |
| 31-40 | Brute Force • Charge Phase 1 • Charge Phase 2 • Dark Prisoner • Charge Phase 3 • Thunder • Infiltration • Convergence • Inferno • Starship |
| 41-50 | High Density • Dozing Beast • Crossing • Search • Waterside Bugs • Annihilation • Natural Calamity • Steel Beast • Void Ship • Blue Fighters |
| 51-60 | Earth Defenders • Fleet Attack • Mountain Pass Trap • Fortress Frenzy • Pincer • Ravages of War • Crash • Air Mobilization • Bug Invasion • Transport Ship Surprise Attack |
| 61-70 | Bug King • Crazy Skies • The Fleet Below • Ill Omen • City of Horror • Mountains Ablaze • Breaking Through (2) • Bug Tower • Fortress Attack • Mountain Liberation |
| 71-80 | Battle of Giants • Sniper Attack • Mountain Giants • Towering Beast • Teeth of the Universe • Giant Ship • Spearhead • Tower Siege • Den of Thieves • Death Queen |
| 81-90 | Machine Squad • Monster Party • Labyrinth of Light • City Flaws • Monster Camp • Fallen Flagship • Heaven's Army • Encircling • Divine • The Threat |
| 91-98 | Troubled Valley • Battle to the Death • Massive Mobilization • Legion of Monsters • Scorching • Demon Army • Surrounded! • Star Eaters |
| DLC 1: Time of the Mutants | Air Offensive • Giants Advance • Recon • Dust Town • Defense Line • Underground Advance • War Breed • Mountain Assault • Enemy Camp Infiltration • Dark Arena • Beast Mountain • God's Army • The Gathering • Armored Species • Iron Wall • Silver Base • Shifting Mountain • Whirlwind of Death • Bugged City • Toughness • Golden Darkness • True Sovereign • Final Impact • Floating Fleet • Into Destruction • Ship of Dragons |
| DLC 2: Extreme Battle | Tracking Bogeys • Underground Complex • Blocked Pass • Close Formation • Dragon Ship Fleet • Heavy Artillery • Overflight • Dangerous Goldmines • Beast Mobilization • Total Protection • Bombs Away • King of Armor • Cannon Defenders • Bloody River • Three Giants • Traps from Behind • The Four Horsemen • Cross the Line • Facing Off • Crimson Lotus • Shivering Nexus • Last Bastion • Starry Prison |