Metal Slug Defense (Japanese Name :メタルスラッグディフェンス - Metaru Suraggu Difensu) is a tower defense game created by SNK Playmore for iOS and Android mobile devices. It was also ported to Steam.
Several years after General Morden's coup d'etat attempt was defeated... The scattered remains of the Rebel Army have become organized again.
Military intelligence finds that General Morden is alive, and planning another coup d'etat.
The Rebel Army and aliens are revealed as behind the mysterious phenomenon happening around the world.
To stop the rebels and aliens from reaching their goals, military intelligence musters troops and dispatches them around the world.
General Morden and the aliens' lust for power pushed the world to the brink of destruction and chaos, only to be stopped at the last moment by the military.
But this does not mean that peace is at hand.
General Morden's death remains unconfirmed...
Could he have survived yet again?
If so, when and how will he attempt this next coup d'etat?
And the aliens, as well...
The heroes struggle will not end. So long as there is a battle to be won on our world, they will be there.
The gameplay is a one vs one tower defense/strategy game, with two "sites" on either side of the stage where units are spawned. The main objective of the game is to destroy the opposing site by any means.
Once the game begins, forces begin accruing "AP", which is used to produce units that automatically advance toward the enemy's site. These units can either assault enemies, construct objects that impede enemies or support allied units, or produce additional units at no cost. Paying Rumi Aikawa a certain amount of AP will improve the rate that AP builds as well as the maximum AP that can be held at once.
Most units have both a standard attack and a special attack. When the unit is within range of an enemy unit or structure, it will begin its standard attack. After a predetermined length of time, the unit's special attack will be available, indicated by a light blue "aura" surrounding that unit. Tapping that unit activates its special attack, which is instantly used. After finishing the special attack, the unit will continue with its standard attack until the special attack is charged again. A maximum of ten units can be in a deck in a fight.
After a sufficient length of time, a "Metal Slug Attack" (MSA) will be made available. Activating this will send a rapid-moving Metal Slug barreling toward the opposing side, exploding on impact. The MSA will run over (and instantly kill, regardless of amount of health) any light infantry, but will explode after running over ten units in a row. The MSA will also explode on impact with any vehicles or "heavier" infantry (includes Tar Men and Zombie Marco).
Two currencies are available: Metal Slug Points (MSP) and Medals. MSP is won from completing stages, and can be used to improve base qualities or increase unit health. REWARD-UPs can be used prior to starting a stage, and will increase MSP earnings by 50%, even after losing. Medals are premium currency, and are used to either purchase tools, swap for MSP, or purchase units from the store. Players have the option of buying Medals.
Similarly to all Metal Slug games, POWs can be found and freed and reward the player with certain benefits (albeit not in the same manner). Freeing one POW for each stage in a location usually activates a special ability that improves the player's fighting capabilities, such as reducing the cooldown time for units to be produced or increasing the MSP earned from completing a stage, with each subsequent POW rescued adding on greater benefits.
At each stage completion, a letter grade is assigned to the player based on how long he/she took to complete that stage (D, C, B, A, S, from lowest to highest). The faster the player completes the stage, the higher the letter grade, and the more bonus MSP is awarded.
EMERGENCY stages will occur at certain times of the day, and appear as red locations rather than blue. These stages are accessible for a one hour time frame, after which they disappear. Rescuing all POWs (regardless of how long it took) awards the player with a unique unit, removes the accessible time frame (making it available at all times), and unlocks the subsequent EMERGENCY stage.
List of units
The following units are awarded to players as they progress through the game. *Max level unlocked
|Unit||AP||HP (Max)||Standard (Range)||Special (Range)||Speed||Production||Acquisition|
|Soldier||30||200 (500)||Knife (Very Short)||Grenade (Normal)||Normal||Very Fast||---|
|Marco||60||320 (640)||Handgun (Normal)||Heavy Machine Gun (Normal)||Normal||Slow||Clear World 1: Area 1|
|Tarma||65||360 (720)||Handgun (Short)||Shotgun (Short)||Fast||Normal||Clear World 1: Area 2|
|Eri||70||250 (500)||Handgun (Long)||Laser Gun (Very Long)||Normal||Slow||Clear World 1: Area 3|
|Fio||75||260 (520)||Handgun (Normal)||Rocket Launcher (Long)||Normal||Slow||Clear World 1: Area 4|
|SV-001||250||2000 (5000)||Vulcan (Long)||Cannon (Long)||Normal||Very Slow||Clear World 1: Area 5|
|SV-Camel||80||700 (1400)||Machine Gun (Normal)||Rapid-Fire Grenades (Normal)||Normal||Slow||Rescue all POWs in World 1: Final Area|
|100||1000 (2500)||---||---||Normal||Very Slow||Rescue all POWs in World 1: Emergency Area 1|
|Di-Cokka||100||900 (1800)||H-Cannon (Long)||3-Shot H-Cannon (Long)||Slow||Slow||Rescue all POWs in World 1: Emergency Area 2|
|NOP-03 Sarubia||200||3500 (7000)||Cannon (Normal)||2-Shot Cannon (Normal)||Very Slow||Very Slow||Rescue all POWs in World 1: Emergency Area 3|
|Hopper Mecha||50||800 (1600)||Self-Destruct (Very Short)||Massive Self-Destruct (Very Short)||Normal||Fast||Rescue all POWs in World 1: Emergency Area 4|
|Zombie Marco||240||1800 (3600)||Handgun (Normal)||Vomit Laser (Very Long)||Slow||Very Slow||Rescue all POWs in World 2: Final Area|
|Abul Abbas||130||1500 (3000)||Sword (Very Short)||Call Subordinates||Fast||Slow||Rescue all POWs in World 2: Emergency Area 1|
|Allen O'Neil||350||3500 (7000)||Heavy Machine Gun (Long)||Grenade (Very Long)||Fast||Slow||Rescue all POWs in World 2: Emergency Area 2|
|Donald Morden||950||7000 (14000)||Bazooka (Short)||Hi-Do Bombing Run (Very Long)||Slow||Very Slow||Rescue all POWs in World 2: Emergency Area 3|
|Mars People||45||300 (600)||Ray Gun (Long)||Warp (Long)||Slow||Very Fast||Rescue all POWs in World 2: Emergency Area 4|
|Ostrich Slug||80||600 (1200)||Machine Gun (Long)||Grenade (Long)||Very Fast||Slow||Day 15 Log-in Bonus|
|Elephant Slug||400||4000 (8000)
|Vulcan (Long)||Flamethrower (Very Long)||Slow||Very Slow||Day 30 Log-in Bonus|
|Fat Marco||55||handgun||Heavy Machinegun (spread)||Rescue all POWs in Another World 1: Daily Event (Monday)|
|Fat Tarma||60||handgun||Shotgun||Rescue all POWs in Another World 1: Daily Event (Tuesday)|
|Rescue all POWs in Another World 1: Daily Event (Wednesday)|
|Fat Fio||70||handgun||rocket launcher||Rescue all POWs in Another World 1: Daily Event (Thursday)|
|Slug Copter||240||(1600)||Vulcan||-||Normal||Slow||Rescue all POWs in Another World 1: Daily Event (Friday)|
|Flying Tara||70||(750)||Drops missile||-||Very Fast||Fast||Rescue all POWs in Another World 1: Daily Event (Saturday)|
|Samurai Planes||180||Vulcan||-||Fast||Slow||Rescue all POWs in Another World 1: Daily Event (Sunday)|
|Shock Wave (Short)||Normal||Very Slow||Free event, 10,000,000 players celebration.|
|Trevor (Mummy)||100||Rescue all POWs in World 3: Final Area|
|Elite Arabian Soldier||90||Sword
|Normal||Normal||Rescue all POWs in World 3: Emergency Area 1|
|Cyborg Allen O'Neil||400||Heavy Machine Gun
|Grenade (Very Long)||Normal||Very Slow||Rescue all POWs in World 3: Emergency Area 2|
|Bazooka (Normal)||Bazooka (Normal)||Normal||Slow||Rescue all POWs in World 3: Emergency Area 3|
|Mars People Cadre||60||(2000)||Ray Gun (Long)||Ray Gun (Long)||Normal||Long||Rescue all POWs in World 3: Emergency Area 4|
The following units are added to the unit shop, as players progress through the game.
|Unit||AP||HP (Max)||Standard (Range)||Special (Range)||Speed||Production||Price|
|Rebel Infantry||25||180 (360)||Knife (Very Short)||Grenade (Normal)||Normal||Very Fast||
|Bazooka Soldier||30||180 (360)||Bazooka (Normal)||Rapid-Fire Bazooka (Normal)||Normal||Very Fast||10 Medals|
|Rebel Rifleman||35||180 (360)||Rifle (Long)||Rapid-Rifle Fire (Long)||Normal||Very Fast||10 Medals|
|Shielded Soldier||30||500 (1000)||Sword (Very Short)||Shield-Push (Short)||Normal||Fast||20 Medals|
|Gatling Soldier||40||260||Gatling (Long)||Rapid-Gatling-Fire (Long)||Slow||Fast||20 Medals|
|Bikers||50||500 (1000)||Bazooka (Normal)||Rapid-Fire-Bazooka (Normal)||Very Fast||Fast||20 Medals|
|Mummy||40||800||Mummy Poison (Very Short)||Poison Bullet (Long)||Slow||Fast||90 Medals|
|Dog Mummy||35||450||Mummy Poison (Short)||Mummy Poison *3 (Short)||Fast||Fast||90 Medals|
|Mummy Generator||100||1500||---||---||---||Very Slow||120 Medals|
|Arabian Fighter||35||450 (900)||Sword (Very Short)||Rapid Swing (Very Short)||Fast||Very Fast||20 Medals|
|Arabian Soldier||30||250 (500)||Sword (Very short)||Sword-Throw (Normal)||Normal||Very Fast||10 Medals|
|Camel Rider||40||800 (1600)||Handgun (Normal)||Rapid-Fire Handgun (Normal)||Fast||Very Fast||20 Medals|
|Chowmein-Conga||40||600 (1200)||Claw Strike||Foam Shot||Normal||Very Fast||30 Medals|
|Ohumein-Conga (Red)||240||3000||Foam||Claw Rush||Fast||Slow||150 Medals|
|Ohumein-Conga (Green)||240||3200||Foam||Claw Rush||Normal||Slow||150 Medals|
|Ohumein-Conga (Brown)||240||3600||Foam||Claw Rush||Slow||Slow||150 Medals|
|Crab Nest||100||1500 (3000)||---||---||Very Fast||Very Slow||120 Medals|
|Zombie (Man)||45||600||Bodily Fluids (Short)||Bodily Fluids (Normal)||Slow||Very Fast||20 Medals|
|Zombie (Woman)||45||500||Bodily Fluids (Short)||Bodily Fluids (Normal)||Slow||Very Fast||20 Medals|
|Zombie (Fattish Man)||45||800||Bodily Fluids (Short)||Bodily Fluids (Normal)||Slow||Fast||20 Medals|
|Rebel Zombie||45||700 (1400)||Self-Destruct||Massive Self-Destruct||Slow||Fast||50 Medals|
|Tar Man||75||1200 (2400)
|Bodily Fluids (Normal)||Bodily Fluids (Normal)||Slow||Fast||100 Medals|
|Anti Air-Craft||60||850||---||---||---||Normal||30 Medals|
|Spike Bunker||70||800||---||---||---||Normal||30 Medals|
|Iron Iso||120||play World2, East Asia stage 2||Slow||30 Medals|
|Girida-O||70||Tank Cannon (Normal)||Rapid-Fire Tank Cannon (Normal)||Normal||Slow|
|M-15A Bradney||90||Large Missile||Rapid-Fire Large Missile||Normal||Slow||30 Medals|
|T-2B Melty Honey||210||40 Medals|
|Mutated Soldier||40||500||Self-Destruct||Massive Self-Destruct||Fast||Very Fast||50 Medals|
|Slugnoid||80||1100 (2200)||Double Machine Gun||Iron Lizard||Normal||Normal||60 Medals|
|Drill Slug||150||2000 ||Machine Gun||Drill||Fast||Slow||60 Medals|
|Bradley||100||1800||Vulcan||Rapid-Fire Large Missile||Fast||Slow||60 Medals|
|Metal Crow||220||3600||Vulcan||Rocket Launcher||Slow||Slow||60 Medals|
|Utan||40||260||Uzi||Rapid-Fire Uzi||Slow||Fast||100 Medals|
|SV-001 Experimental||220||Free all POW's on World 1, Final Stage.||Slow||100 Medals|
|SV-001 Type-R||220||2500||Free all POW's on World 1, Final Stage.||Slow||100 Medals|
|Mars Mecha||400||5000 (10000)||Very Slow||100 Medals|
|Ring Laser Mecha||100||Normal||100 Medals|
|Hyakutaro||80||320||Energy Ball||5-Shot Energy Ball||Slow||Normal||120 Medals|
|Man Eater||80||World2, South America, Stage3||Fast||120 Medals|
|LV Armor||80||1200||Machine Gun (Long)||Cannon (Long)||Normal||Slow||120 Medals|
|Slug Gunner||270||3600 ||Very Slow||180 Medals|
|Shoe||350||5000 ||Cannon/Missile (Long)||Slow||Very Slow||220 Medals|
|Karn||350||5000 ||Cannon/Missile (Normal)||Rapid-Fire Cannon (Long)||Slow||Very Slow||220 Medals|
|Monoeye||180||World2, North Asia, play all stages||Normal||240 Medals|
|Iron Nokana||450||Slow||270 Medals|
|Jupiter King||900||6000 (15,000 hp at lvl 30)||Spread/Long: Beam Laser||---||play all stages on world2, stage10||Very Slow||300 Medals|
New Purchasable Units
The following units were added to the unit shop when updates have been made to the game.
|Unit||AP||HP (Max)||Standard (Range)||Special (Range)||Speed||Production||Price|
|Ralf||120||1600 (3200)||Flame Shot (Normal)||Galactic Ghost (Long)||Normal||Slow||150 Medals|
|Clark||140||1200 (2400)||Iron Lizards (Long)||Super Argentine Backbreaker (Long)||Normal||Slow||150 Medals|
|Leona||80||1400 (2800)||Knife (Very Short)||Moon Slash (Very Short)||Very Fast||Slow||150 Medals|
|Trevor||100||1000 (2000)||Two Machine Guns (Long)||Jumping Two Machine Guns (Long)||Fast||Slow||100 Medals|
|Nadia||80||700 (1400)||Slow||100 Medals|
|Samurai Infantry||30||400||KATANA (Very Short)||Cannonball (Long)||Fast||Very Fast||20 Medals|
|Samurai Tanks||80||1500 (3000)||Tank Cannon (Long)||Rapid-Fire Tank Cannon (Long)||Normal||Slow||30 Medals|
|Maggot||90||500 (1000)||Diving Attack (Very long)||Stampede (Very Long)||---||Normal||20 Medals|
|Big Snail||120||1800 (3600)||Acid Spit (Short)||Protect||Normal||Slow||40 Medals|
|Giant Caterpillar||380||(9000)||Acid Bubbles||Stampede||Slow||Very Slow|
|Iron Nokana MK II||420||Very Slow||280 Medals|
|Clone Fio (Zombie)||180||1400||Handgun (Normal)||Vomit Laser (Very Long)||Slow||Slow||100 Medals|
|Clone Eri||60||700||Machine Gun (Normal)||Flame Shot (Normal)||Normal||Fast||100 Medals|
|Metal Rear||600||7500 (15000)||Heavy Vulcan (Long)||Heavy Vulcan Strafe (Very Long)||Normal||Very Slow||280 Medals|
|Guerrilla||35||400||Knife (Short)||Powered up hand gun (Normal)||Fast||Very Fast||25 Medals|
|Shielded Guerrilla||45||800||Handgun (Short)||Shield||Normal||Fast||25 Medals|
|Bazooka Guerrilla||40||400 ||Bazooka (Normal)||Rapid-Fire Bazooka (Normal)||Normal||Very Fast||25 Medals|
|Special Force||65||700 ||Bomb (Normal)||Bomb setting up (Normal)||Normal||Very Fast||30 Medals|
|Gunner Unit||85||1600||Punch (Very Short)||Rapid-Fire Vulcan (Long)||Normal||Slow||90 Medals|
|Hover Units||240||200 ||Drops Missile (Normal)||---||Very Fast||Fast||120 Medals|
|Flying Killers||160||Slow||Very Fast||100 Medals|
|Missile||Bomb Release||Fast||Normal||200 Medals|
|Hover Vehicle||140||500 ||Stealth Bombing (Normal)||---||Normal||Slow||210 Medals|
|Sniper||50||700||Rifle (Long)||Snipe (Very Long)||Normal||Normal||90 Medals|
|Commander||200||900 ||Sortie orders, Air Army (Long)||Power Up Handgun (Long)||Normal||Slow||220 Medals|
|MG Unit||85||1200||Machine Gun (Long)||Machine Gunfire (Long)||Normal||Slow||100 Medals|
|Claw Unit||100||*4000||Charge||Strike||Normal||Normal||180 Medals|
|MV-280B||90||800||Rocket Launcher (Long)||Charge (Long)||Very Fast||Slow||120 Medals|
|Girida-O Ver. P.M||180||2800||Tank Cannon (Normal)||Rapid-Fire Tank Cannon (Normal)||Normal||Slow||150 Medals|
|Di-Cokka Ver. P.M||200||3000||H-Cannon (Long)||3-Shot H-Cannon (Long)||Slow||Slow||180 Medals|
|Flying Tara Ver. P.M||100||500||Drops Missile (Very Long)||---||Very Fast||Fast||180 Medals|
|Special Force (Rider)||90||900 ||Special (Very Long)||Special (wheelie) (Very Long)||Normal||Fast||200 Medals|
|Hazmat Soldier||30||400||Grenade (Short)||Grenade (Long)||Normal||Fast||90 Medals|
|Scientist (Zombie)||35||700||---||---||Slow||Very Fast||60 Medals|
|Augensterm||450||6000 ||Vulcan (Normal)||Wire (Normal)||Normal||Very Slow||240 Medals|
|Slug Flyer||400||2000 ||Missile (Very Long)||Vulcan (Very Long)||Fast||Slow|
|Slug Gunner Prototype||320||3000
|Vulcan (Long)||Cannon (Very Long)||Normal||Slow||230 Medals|
|Vulcan (Long)||Cannon (Long)||Normal||Slow||120 Medals|
|Yami Barai (Long)||Orochinagi (Long)||Normal||Slow||300 Medals|
|Raijinken (Very Short)||Raikouken (Very Short)||Very Fast||Slow||300 Medals|
|Standing SK (Short)||Jirai Shin (Very Long)||Normal||Slow||300 Medals|
|Aoi Hana (Medium)|
|Saika (Medium)||Normal||Fast||300 Medals|
|Metal Massacre (Short)||Ebony Tears (Very Long)||Normal||Fast||300 Medals|
|Mayhem (Medium)||Outrage (Medium)||Normal||Fast||300 Medals|
The following are packs of units that can be purchased at a lower price set. (The price of a pack will not change if the player already has a unit that is in a pack.)
|Pack||Unit Set||Price||Save Medals||Included|
|Soldier Pack||7||70 Medals||20 Medals||
|Mummy Pack||3||270 Medals||30 Medals
|Arabian Pack||3||40 Medals||10 Medals
|Crab Pack||5||500 Medals||
|Zombie Pack||5||180 Medals||
|Monkey Pack||4||300 Medals||(17% off)||
|Soldier Pack (Ver. Winter)||6||140 Medals||(12% off)||
|Future Rebel Pack||4||240 Medals||(20% off)||
The following is a chart of units that cannot be obtained by the player but appears as bosses, bases or support enemiy units. (Some of the NPC units are edited to available in later version)
|Unit||HP (Max HP)||Standard (Range)||Special (Range)||Speed|
|Huge Hermit (Early Stage Version)||10000
|Cannon (Short)||Giant Machine Gun (Long)||Very Slow|
|Big Shiee (NPC Version that the Treads was not clearly seen.)||20000
|Primary Battery (Long)||Secondary Battery (Short)||Very Slow|
|The Keesi (The First Version without Bull Chan on its wing.)||10000
|Jet Engine (Normal)||----||Very Slow|
|Monoliths Drop (Long)||Rapid Drop Monoliths (Very Long)||Cannot Move|
|Huge Hermit (Full Performance Version)||10000
|Turret Cannon (Long)||Rapid-Fire Cannon (Very Long)||Slow|
|Turret Cannon (Long)||Rapid-Fire Cannon (Very Long)||Very Fast|
|Railgun (Short)||Hydro Cannon (Very Short)||Slow|
|Energy Sphere (Long)||Energy Cannon (Very Short)||Very Slow|
Steam DLC Packs
The DLC on Steam release are purchaseable by purchase on METAL SLUG DEFENSE Steam DLC Page.
|"KOF Pack" Vol.1||7||$8.80 Steam Wallet|
|“Regular Army Pack” Vol.1||3||$5.31 Steam Wallet|
Recommended Purchased Units
If money is an issue and budgeting Medal reserves is necessary, these units are good choices to have. Disclaimer: the following are opinion based. Usefulness is largely dependent on playstyle.
- SV-001 Experimental (100 Medals): Great health and range. Speed is subpar but not an issue. An improvement over standard SV-001 but cheaper to produce.
- Girida-O (30 Medals): Excellent choice for starting players. Cheap to produce, strong attack with stronger special attack
- Slugnoid (60 Medals): "Crowd buffer" unit. Good range, with an unpredictable (but nonetheless useful) special attack.
- LV Armor (120 Medals): Improved version of Slugnoid. Identical range, but special attack is instant and reliable
- Hyakutaro (120 Medals): Unparalleled range, great special attack, very cheap to produce. Works wonders when given enough allied units to hide behind.
- Chowmein-Conga (30 Medals): Cheap, fast moving, fast producing with extraordinary armor. Can easily overwhelm opponent from start to finish.
- Bikers (20 Medals): Fast moving, fast producing. Allows extra damage to be dealt when heavy units are still on cooldown. Keeps up pressure while units are moving across battlefield.
- Mars Mecha (100 Medals): "Tank" unit. Not very useful for attacking, but large hitbox easily diverts damage away from allied units. Cannot be knocked back.
- Vanguard (220 Medals): Expensive to produce (450 AP) but extremely powerful. Most common units can be killed with three oft it's shots. Three of them at lv. 30 can beat even the most difficult Levels on their own.
- Hi-Do (400 Medals): 2nd Most expensive unit in the game, but also extremely powerful. Both in attack and defense. Morden fires rockets at enemies that are close while a barrage of 6 missiles bombard enemies at long range. It's special attack is to fly above above enemy units and open up with it's chain gun for heavy damage, then it flies back to behind your base.
In the presence of Wi-Fi, the player can access "Wi-Fi VS", which pits the player against other human players in ranked matches. Players on iOS may also play matches against friends from the Game Center. Completing matches earns points to the player's name, and match outcomes are tallied on the Wi-Fi VS home page (though opponents will only be able to view number of wins). 3 Medals are awarded to the player for every 20,000 points accumulated, and a sum of 1,000 MSP is awarded for every loss incurred.
As of version 1.5.0 of the game, a new mode has been added where you can play 2-on-2 matches that includes a chat feature. Every 5 wins in this game mode will give you 3 Medals along with the 3 Medals obtained every 20,000 points accumulated in both modes (1-on-1 and 2-on-2).
- This game recycles stuff from Metal Slug Wars like themes, characters art & design.
- This game marks the official debut of Heidern and Whip from the King of Fighters series in the Metal Slug universe.
- This game revealed many official names of the enemies likes The Invaders, Bull Drill, Crablops and much more.
- While Metal Slug Defense derives its assets from the first three Metal Slugs, MSD is most heavily influenced by Metal Slug 3. Most of the game's backgrounds, units, and stage bosses as well as its ending cinematic is derived from Metal Slug 3. Recent updates adds assets from Metal Slug 5.
- This is the only game to have almost all heroes (excluding Tequilla), either as a playable character or as a cameo.
- Metal Slug Defense makes use of previously unused sprites from previous games like Abul Abbas attacking and the frames before he waves the white flag, Nadia eating chocolate, Natives in fire and much more.
- After clearing the first world, Satiko Suzuki will appear on the title screen. Clearing the second world will make a Mini-UFO fly in the skies randomly, and clearing the third will will spawn a destroyed Metal Slug and the Di-Cokka on the ground, right side of the logo.Clearing more worlds such as 4-8 will appear more at the title screen (Each world makes it very hard to clear)
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