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Video Game: Metal Slug Defense
Metal Slug Defense is a mobile game released rather suddenly by SNK in 2014. As made apparent by the title, it is a Tower Defense game set on the Metal Slug universe. Players spend a constantly filling meter on characters of varying properties, which then march foward in hopes of overwhelming and destroying the opposite base. The various human, machine and monster units have unique charged moves which sometimes require good timing to be used correctly.

The game can be played online with friends or random people. As it is a free-to-play game, there are elements such as layers of level grinding, missions costing credits that recharge over time and most of the unlockable characters only being available through a secondary currency more accessible for those willing to spend money on it.

In general, however, it is a well-thought and interesting adaptation.

Tropes:

  • Action Bomb: The Zombie Rebel Soldier, Mutated Soldier and the Hopper Mecha units self-destruct upon reaching a target. The player can also release an explosive SV 001 once its meter is filled.
  • Actually Four Mooks: The Hover Unit is deployed in groups of three to justify their high AP cost.
  • Advancing Boss of Doom: Every enemy is moving towards the player's base, after all. Even ones such as Jupiter King, who originally moved away. The Huge Hermit - who is the only enemy on its mission - even instakills anything it hits, no matter how much health the target has.
  • Always Accurate Attack: Tetsuyuki sometimes fires a laser that hits the entire field, player base included. Morden's special is to summon the Hi-Do to drop bombs everywhere.
  • Announcer Chatter: The announcer does his thing when the main characters use their special attack, such as Marco using the HEAVY MACHINE GUN or Fio using the ROCKET LAUNCHER, for example.
  • Anti-Air: Certain units have attacks that either shoot projectiles in an arc or at a high angle, allowing them to damage aerial units. The most notable example is the Ptolemaic "Gunnner Unit" (sic), whose special attack sprays bullets in a wide angle.
  • Anti-Poop Socking : Missions cost a certain amount of Sortie points which recharge over time. It actually isn't too troublesome after you expand the Sortie point limit to over 400... Unless you're playing the latter levels over and over to get prisoners.
  • Ascended Extra: Sandbags, usually used by granede-wielders of the Rebel Army for protection, are an essential tool for survival in this game.
  • Asteroids Monster: The Man Eater plant's special attack is to turn into two seeds that spawn little man eaters.
  • Attack! Attack! Attack!: All units will advance foward and exchange fire with enemies until being killed.
  • Awesome, but Impractical: Zombie Marco's powerful and far-reaching blood vomit jet takes a long time to charge up, especially after being used once. Meanwhile he fights with a gun much weaker than normal Marco's and gets face-to-face with enemies despite being a gun user. And upon being hit enough to be knocked down, he takes far too long to stand up.
    • Morden may have a great special attack, but his standard attack is not as effective as his 950 AP cost would lead you to believe and he tends to get knocked back often, leaving the rest of your units exposed as he tries to make his way back to the front.
  • Big Bad: Morden actually fights on an alien tank without being betrayed this time. The Mars People receive more focus in the last set of bonus levels. While not much of the Amadeus Syndicate is seen in the game, an expansion later added a bunch of units and some levels from the Ptolemaic Army.
  • Big Creepy-Crawlies: The Maggot, Snail and Giant Caterpillar units.
  • Bigfoot, Sasquatch and Yeti: The Sasquatch is one of the better close-range characters due to its speed and high stats.
  • Bonus Dungeon: At certain hours, a harder set of missions becomes available for 60 minutes. A 100% clear set will become permanently available, setting the next one to appear later. There are four in total.
  • Boring, but Practical: The Rebel Rifleman has a bit less HP than the basic soldier, but is still cheap at 60 AP and shoots from afar while protected by tougher units. The Bikers cost 90 AP but have 1000 HP at level 20 and move faster, while otherwise acting just like the riflemen and complementing them well.
    • The Iron Iso is a stationary tank-turned-artillery-turret that fires long-range piercing shells. That's all it does, but you'd be surprised how much it can accomplish if you keep building them in the same area.
  • Boss Arena Urgency: The Huge Hermit crushes the bridge on its way to the player.
  • Boss Battle: Some bosses from the first trilogy such as Shoe & Karn, Iron Nokana and Monoeye show up in certain levels, usually spawning when your units get close to the enemy base.
  • Bottomless Magazines: In a moment of weakness, units only reload their weapons after using a special attack.
  • Bribing Your Way to Victory: Silver medals can be used to buy items that grant advantages in the missions, such as beginning with full AP regeneration, getting more money after clearing a mission or even unlocking all missions at once. Most units can only be bought with silver medals, too.
  • The Cameo: Every heroic character from the series is at least mentioned in the game, even those from the Mission and Advance spinoffs or the Ikari Warriors (including Whip and Heidern). The villain side doesn't get such attention, though recent updates have been trying to rectify that with new units and extra missions.
  • Cap: The level cap for units and the player base's attributes is 10, but it expands to 20 once the second loop is unlocked. During gameplay, AP recharge speed can be improved 10 times and there is also a limit to how many units can be sent at once.
  • Charged Attack: Most units can use a special move by spending a meter that fills over time. Oddly, few CPU characters use their special move.
  • The Computer Is a Cheating Bastard: For some reason, the CPU doesn't use special moves even in the second loop but it does work by its own rules in regards to unit creation. It spawns powerful high-cost units from out of nowhere once you get close or hit its base.
  • Defeat Means Playable: Clearing a set of levels usually means unlocking the enemies featured in them... to be bought at the shop. The ones unlocked by collecting certain sets of prisoners or getting login bonuses are granted for immediate use, though. Tetsuyuki and Huge Hermit are unplayable due to being overpowered living bases. For some reason the trains from the subway levels can't be unlocked (yet?) either.
  • Dual Boss: Some missions like to spawn large enemies such as Shoe and Karn or all three Ohumein-Conga at once at some point.
  • Elite Mook: The Ptolemaic army units are this compared to their Rebel army counterparts, with their higher HP and the AP cost to go with it, though they do have different methods of attacking.
  • Everything's Better with Monkeys: Utan, lover of bananas, is unlockable from the beginning.
  • Everything's Deader with Zombies: The zombie enemies from Metal Slug 3 are present. This includes Zombie Marco, who can vomit a danguerous jet of blood.
  • Everything Fades: Dead units may fade, melt or explode.
  • Evil Laugh: Allen frequently laughs while attacking. Morden only laughs in his victory pose.
  • Excuse Plot: Morden and the martians are up to no good, so send waves of units at their bases.
  • Extended Gameplay: Clearing the game once unlocks a harder loop. It is more of the same in the old arenas with leveled-up enemies, but some missions can surprise the player with an out-of-place boss such as Allen. Later updates added more levels and units, as well as an mode that gives you pre-made unit decks to overcome certain situations.
  • Exty Years from Now: The game takes place on 20XX.
  • Flavor Text: Each unit has a description about who they are and what they do.
  • Final Boss: The final set of boss enemies at 16-5 (second loop) are Iron Nokana+Allen and then Morden+Jupiter King.
  • Gatling Good: Units such as Marco, some Slugs and Allen wield this weapon either normally or as their special attack.
  • Glass Cannon: The HP of the player's base isn't such an important stat to upgrade first because if a decent group of units reaches a base at all, it will most likely be done for because defending units won't have time to charge their special moves to do useful damage and can't even cover their base's hitbox.
    • Tarma's shotgun is powerful, but he needs to get close to enemies for it to hit and if he does use it, his 720 max HP won't keep him alive for a second shot.
  • The Goomba: The basic blue soldier you start with. Cheap and with 400 HP at level 20. He attacks at close range with a knife and can throw granades. The green normal rebel soldier is an unlockable and he has even less health (360 at level 20) for an even lower price.
  • Hitbox Dissonance: The hitbox for the bases is a bit taller than the base itself and some explosions hit farther than they should. The man that sets up barriers will flee whenever a projectile happens to fly above him, as if he was hit.
  • Humongous Mecha: Jupiter King from Metal Slug 3 first appears in area 10, stage 4. The Mars Mecha is also present in the last set of bonus levels.
  • Idle Animation: The status screen for the units are where you get to see them standing still. Amusingly, rather than going through a standing animation and then a special one before looping over like everyone else, Marco is completely asleep.
  • Immune to Flinching: A select few have this valuable trait, and most of them are great meatshields. Oddly enough, the Rebel Biker does not flinch despite having low HP commonly found among infantry units, and in an interesting twist, the shielded soldiers have such low flinch resistance that they get knocked back on every hit, but their knockback duration is so low that they might as well be immune to knockback anyway.
  • Infinity+1 Sword: The Mars People are unlocked on the last level set. They spam laser bubbles at a safe distance (and can fire from above by warping), cost only 80 AP and are produced very quickly. They do need a meat shield to compensate for the slowness of their bubbles, however.
    • By logging on the game every day, you'll eventually get the Elephant Slug, which has plenty of HP and a fireball attack with great reach.
  • Insurmountable Waist-Height Fence: Sandbags block enemy advances until they're destroyed. In normal Metal Slug games, people would just jump over them instead.
  • Kamehame Hadouken: Hyakutaro can fire energy balls from his hands.
  • Knockback: Most units suffer from this upon being hit by powerful attacks but surviving. This is important as knockback cancels out attacks that have already been started and gives invincibility frames for the duration of the knockback.
  • Know When to Fold 'Em: Abul Abbas waves a white flag and disappears when out of HP.
  • Lightning Bruiser: The Natives, at least when they were introduced, had 300 more HP than Chowmein-Conga (which has the highest HP for a 40 AP cost) and a faster speed in exchange for only 5 more AP cost. Their standard attack is above average for an infantry unit while their special attack has a ridiculous range and deals even more damage.
  • Limit Break: A self-destructing SV 001 can be sent when its meter fills. It insta-kills a good number of small enemies before exploding upon colliding with a larger enemy or the opposing base. This is important when fighting Jupiter King, which makes such a mess out of anything you send at it that, at least early on, you're forced to just buy time and try to get rid of large enemies until the bombastic SV 001 is available for damaging and pushing King away.
  • Luckily My Shield Will Protect Me: Shielded Soldiers, who have higher HP than their fellow rebels. Their special move is to make a pushing motion, which blocks all damage. Snails, too, can hide in their shells. Some missions require you to use their defense at the right times to win.
  • Made of Iron: For obvious reasons, Allen O'Neil, a barechested soldier, has HP comparable to that of a heavy tank.
  • Man on Fire: Some units have a burned animation for when they're killed by one of the few fire attacks available.
  • Mecha: The Slugnoid, the LV Armor and the Slug Gunner.
  • Megaton Punch: Ralf has the notorious Galactica Phantom punch as his special attack.
    • Gunnner Units have a powerful punch as their standard attack.
  • Mighty Glacier: Units that are slow to produce and slow to move, but pack a hefty punch given their AP cost. This includes the two variants of Iron Nokana: very slow production speed, but comes with tons of HP, resists knockback, fires bursts of 3 piercing shells, and depending on which version of Iron Nokana you use, can either use a flamethrower to quickly demolish units that come too close or launch a large salvo of long-range missiles.
  • Mook Maker: Mummy Generators, Crab Nests and 3-Ton Utility Trucks are obstacles that generate units. Also, Abul Abbas's special ability is to summon a Utility Truck.
  • Nerf: The Big Snail used to be a great early-game unit when it was first introduced, having high HP and a devastating short-ranged standard attack that could destroy many other early-game units before they could attack or deliver their full potential. Now its AP cost has been increased and its production speed lowered to discourage snail rushes.
  • Non-Lethal Bottomless Pits: You can see this trope by having Ralf use the Galactica Phantom to fall off Giant Hermit's bridge while the Hermit is knocked some steps away.
  • Nostalgia Level: All arenas are taken from the series' levels. There often is some continuity between them - you can see a piece of the next level just around the corner.
  • Oh Crap: If a sandbag man gets hit before setting a barrier, he freaks out and flees. Rumi is also shown panicking in her icon if a mission is lost.
  • One-Hit Polykill: Some units, like the Ring Laser Mecha, have attacks that can hit any number of enemy units within its range. This is good for dealing damage to important targets that are protected by heavier units, or for clearing away hordes of cannon-fodder units.
  • Randomly Drops: Upgrades are unlocked upon rescuing sets of prisoners, but the prisoners aren't seen in the levels and seem to be saved at random upon finishing a mission, to force replays. It's especially annoying in regards to the harder, expensive missions and the bonus ones that are only available for a short time on each day. Of course, you can use silver medals to buy items that guarantee that one prisoner will appear.
  • Rapid-Fire Fisticuffs: Ralf uses his Vulcan Punches instead of the Flame Shot if he's facing an enemy at point-blank range.
  • Second Quest: Beating all the stages unlocks the World 2 loop, in which enemies are stronger and have more health. To ease this, the level cap for both units and home is lifted from 10 to 20.
  • See You in Hell: Said by Allen upon dying yet again.
  • Shows Damage: Tetsuyuki and the Metal Claw are examples of units that get visible damage as they lose HP.
  • Stationary Boss: Tetsuyuki, a fallen warship used as a base by the rebels in Metal Slug 1. Every once in a while it shoots an unavoidable laser.
  • Stone Wall: Units that have tons of HP but have little attack power on their own, such as the Giant Caterpillar and the Mars Mecha. They are essential for protecting your more powerful units from harm so that they can deal more damage before they get destroyed. The Ohumein-Congas and the Giant Caterpillar are notable for having a special attack that brings them directly to the front of your attack force, shielding the rest of your units from attacks. Donald Morden can also be used stone wall (albeit a very expensive one), simply for having the highest HP among all units.
  • Tank Goodness: Many tanks from the series are available here, from the cute SV 001 to titanic machines such as the Iron Nokana and the Metal Rear.
  • This Is a Drill: The Drill Slug uses its drill as a middle-range charged attack.
  • Timed Mission: The fight against Tetsuyuki has this sense of urgengy, due to the boss being able to use a laser that hits the entire field. Also, multiplayer battles have a 99 seconds time limit and some missions require the player to survive until the countdown ends.
  • Throwing Your Sword Always Works: The Arabian Soldier unit throws his sword as a special attack. His in-game description casts doubt on the usefulness of such a move. He does replace his sword after throwing it, though.
  • Turns Red: Subverted by the Iron Nokana. It is supposed to lift itself and reveal a flamethrower on its bottom when low on HP, but as here the flamethrower is its special move instead, its death animation shows it lifting only to immediately explode.
  • Victory Pose: Done by any unit that had an animation for this in the main games.
  • Walking Tank: The Slug Gunner. The Samurai Tank, amusingly, has two people holding it to move around.
  • A Winner Is You: The game reuses the ending scene form Metal Slug 3, while talking about how the heroes will continue to battle any evildoers. The same ending plays on both loops.
  • You Require More Vespene Gas: Unit creation costs AP, which increases with time and as enemies are killed. When you have enough AP you can also spend it to make it recharge faster. One of the usable items begins levels with a maxed AP regeneration.
  • Zerg Rush: The descriptions for the basic Soldier and the Rebel Infantry advise this strategy, as they cost only 30 AP and have little delay between uses. A shower of their granades sounds good in theory, but it doesn't work so well in practice because they're fragile close-range fighters. The Rebel Rifleman is a more useful unit for this strategy, as explained above.
    • Zerg rushes can also be used with any unit that has either "Fast" or "Very Fast" production speed. With Mutated Soldiers now buffed to have "Very Fast" production, it's possible to Zerg Rush with suicide units.

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