Mountain Pass Trap is the fourty-seventh offline mission and the fifty-first online mission in Earth Defense Force 2025 and the fourty-ninth offline mission and the fifty-third online mission in Earth Defense Force 4.1: The Shadow of New Despair.
Objective[]
2025: We are attacking the insects gathered in the mountains. An attack squad was sent, but they were forced back with casualties. The Retarius forms the hub of the enemy army making advance difficult. We'll send Air Forces a cannon squad and transport units. The Air Raiders will coordinate with these support squads. Good luck.
4.1: Our focus is now on the insects gathered in the mountains. An attack squad was sent, but they were forced back with casualties. The Retarius units now form the hub of the enemy army, making it quite difficult to advance. We'll send Air Forces, a cannon squad, and transport units, and the Air Raiders will coordinate with these support squads. Good luck!
Storyline[]
Storm Team and a team of Rangers are on top of a hill overlooking onto a valley where the Retiarii made their webs with giant insects covering them. The Tactics Officer reports that the Earth Eaters are slowly covering the Earth and most urban regions are lost to them. There isn't any more radio chatter after that. Sometime during the mission Earth Eaters also appear above the mountain. The mission ends when all insects are destroyed.
4.1 Changes[]
The mission starts at a lower area of the map and the webs are almost completely covering it.
The mission features more EDF units, but most of them already caught in the webs. HQ even orders to rescue them at the beginning of the mission.
There are more enemies and on harder difficulties mutant variants will also appear.
Allies[]
2025[]
- A team of 5 Rangers with Assault Rifles appears near the players when they spawn.
4.1[]
- A team of 5 Rangers with Rocket Launchers appears near the players when they spawn.
- 4 individual Wing Divers 2 with LAZRs and 2 with Lances, one of each are squad leaders without squads, caught in the web closest to the players' spawn point.
- A Ranger squad leader without a squad with a Shotgun, caught in the same web as the Wing Divers.
- 5 individual Wing Divers 3 with Idunns and 2 with Thunder Bows, one of each are squad leaders without squads, caught in the web far away in the valley. They only appear when the players entered a certain range.
- 6 individual Rangers 2 with Shotguns and 4 with Rocket Launchers, one of each are squad leaders without squads, caught in the web far away. They only appear when the players entered a certain range.
Enemies[]
2025[]
| Wave | Spawn | Enemy | Amount | Notes |
| 1st | Appears at the beginning of the mission. | Black Ant | 30 | |
| Hornet | 10 | |||
| Retiarius | 8 | |||
| Spider | 10 | |||
| 2nd | Appears after a certain amount of time | Earth Eaters | They are completely passive. | |
4.1[]
| Wave | Spawn | Enemy | Amount | Notes |
| 1st | Appears at the beginning of the mission. | Black Ant | 30 | |
| Hornet | 20 | Hardest or above:
10 normal and 10 Red Hornets instead. | ||
| Retiarius | 9 | |||
| Spider | 60 | Hardest or above:
50 normal and 10 Silver Spiders instead. | ||
| 2nd | Appears after a certain amount of time | Earth Eaters | They are completely passive. | |
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 | 991 | 989 | 545 | 544 | 1238 | 1237 |
| Hard | 2306 | 2572 | 1203 | 1336 | 2882 | 3215 |
| Hardest | 3537 | 4304 | 1818 | 2202 | 4421 | 5380 |
Weapon Level Limit
| Game | Easy & Normal | Hard | Hardest | Inferno |
| 2025 | 14 | 38 | 63 | - |
| 4.1 | 14 | 39 | 65 | - |
Approximate Weapon Drop Rate
| Game | Easy | Normal | Hard | Hardest | Inferno |
| 2025 | 6-10 | 9-13 | 24-36 | 6-61 | 16-76 |
| 4.1 | 5-10 | 8-13 | 24-39 | 2-62 | 17-77 |
Strategy[]
4.1[]
Bring weapons that can deal with swarms of insects with enough range to hit Hornets. Also bring a high damage weapon against the Retiarii.
The mission is mostly a straight road that goes through the valley with the insects paced in small groups along it. While all of them are placed in one wave they won't attack until something provokes them which means that you can move slowly and kill one group at a time.
While it's pointed out on the mission's description that air and artillery support is given, nothing changes gameplay wise and they work like normal. Air Raiders might find it difficult to effectively use them because the webs are covering most of the area and they are protecting the bugs below. However since most support calls shoot multiple shots, if the first shots can destroy the webs the latter ones can get some hits in.
| 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 |