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Metal Slug Defense - Tips on How to Save POWs

An overview of Metal Slug Defense's POW system, and how to free them.

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Metal Slug Defense (iOS, Android) brings SNK's classic franchise to mobile devices with a strategy twist and a hint of frantic tapping. True to its name, the game can be difficult; and freeing captured POWs (prisoners of war) is the primary difficulty hurdle in this F2P title.

This may not be the style of Metal Slug game fans of the series are used to, but it plays well and does justice to the Metal Slug name despite the genre shift for mobile platforms.

Saving POWs is different this time around to go along with the strategy gameplay, and amassing them provides a number of benefits. We're going to into why you should free them, and some tips on how to do so.

Why should you free captured POWs?

The game's actual campaign isn't that long, but some players may have a tough time pushing through the last stages. POWs provide spanning buffs that can help in these stages, and are necessary to be competitive in the game's Wi-Fi VS. mode.

Going out of your way to free POWs is not required to complete the game's campaign, but going after a few buffs will make things easier should you be having difficulty finishing the game.

Once you complete the campaign, all you have left to do in Metal Slug Defense is compete in Wi-Fi VS. mode and collect every POW. Neither one of these tasks are easy.

What buffs do POWs provide?

POWs captures can give you buffs in just about every area, from unit attack damage to maximum sortie points. Here are the current benefits to capturing each area's POWs. Do note some of the wording in-game for these buffs is a bit off, so I will be listing them in my own words.

The first map is the one found to the left in stage selection, and the second is found to the right. The second map's POWs include some characters from another popular SNK series, King of Fighters. The levels on the second map are much more difficult than those of the first, and are best done with units above level 15.

First map's POWs

  • Level 1 (Marchrius Dennis Rossi) - Increases AP accumulation in combat
  • Level 2 (Tarmicle Roving III) - Raises maximum AP value
  • Level 3 (Fiolina Germi) - Reduces production rate in combat
  • Level 4 (Eri Kasamoto) - Increases MSP rewards
  • Level 5 (Gimlet) - Raises base site HP
  • Level 6 (Red Eye) - Increases AP gains from defeating enemies
  • Level 7 (Trevor Spacey) - Increases unit HP
  • Level 8 (Nadia Cassel) - Increases unit attack
  • Level 9 (Walter Ryan) - Increases Metal Slug attack
  • Level 10 (Tyra Elson) - Increases Metal Slug charge speed
  • Level 11 (Rumi Aikawa) - Increases maximum sortie points
  • Level 12 (SV-Camel) - Obtain SV-Camel unit
  • Special level 1 (Abul Abbas) - Obtain 3-Ton Utility Truck unit
  • Special level 2 (Allen O'Neil) - Obtain Di-Cokka unit
  • Special level 3 (Donald Morden) - Obtain NOP-03 Sarubai unit
  • Special level 4 (Mars People) - Obtain Hopper Mecha unit

Second map's POWs

  • Level 1 (Ralf Jones) - Increases AP accumulation in combat
  • Level 2 (Clark Still) - Raises maximum AP value
  • Level 3 (Whip) - Reduces production rate in combat
  • Level 4 (Leona Heidern) - Increases MSP rewards
  • Level 5 (Utan) - Raises base site HP
  • Level 6 (Hyakutaro Ichimonji) - Increases AP gains from defeating enemies
  • Level 7 (Lilly) - Increases unit HP
  • Level 8 (Cynthia) - Increases unit attack
  • Level 9 (Mary) - Increases Metal Slug attack
  • Level 10 (Heidern) - Increases Metal Slug charge speed
  • Level 11 (Madoka Aikawa) - Increases maximum sortie points
  • Level 12 (Zombie Marco) - Obtain Zombie Marco unit
  • Special level 1 (Abul Abbas ) - Obtain Abul Abbas unit
  • Special level 2 (Allen O'Neil) - Obtain Allen O'Neil unit
  • Special level 3 (Donald Morden) - Obtain Donald Morden unit
  • Special level 4 (Mars People) - Obtain Mars People unit

(Note: Special levels appear rarely and must be completed quickly once they do.)

It's not hard to see why you would want these bonuses. The trick to obtaining them is to free at least one POW per stage within a level. With each POW you free, the higher increase to that area's buffs you obtain.

Let's use Level 2 as an example of how the buffs scale with the amount of POWs you've freed. If you save only one POW in each of Level 2's four stages, you will see a 66% increase in your maximum AP. As you free more within a level, you will reach a 100% increase in that level's POW ability.

How do you free captive POWs?

Running from stage to stage trying to free POWs ended up being my primary timesink in the game, and it will likely be yours too.

In order to save a captive POW, you must complete a stage as quickly as possible. This means spamming units and taking down the enemy base quickly, without making many mistakes.

Some stages only have one POW, while others have 2 or more. You can free any number of the available POWs in a single run, provided you are fast enough. The more there are for you to save, more difficult obtaining the last one will be.

Unfortunately there is no sort of visible in-game timer, so the exact time requirements are a mystery. That said, having obtained every POW in the first map sans two special stages, I can confirm saving POWs is based on stage completion speed.

Unit sense

Going on the hunt for POWs requires a more in-depth knowledge of your available units than running the campaign because you need to determine which units are best for reaching the enemy base quickly within a stage.

Two units I can say I use frequently when seeking POWs (but rarely in the campaign) are the Soldier and the similarly grenade-happy Rebel Infantry. Both of these units are cheap on AP, have very fast production times, and do area of effect with their grenade skills.

When you run into a stage you just can't seem to unlock even the first POW in, consider the types of units being thrown your way, and the speed at which they're coming. Consider the following points:

  • Do you need to need to call for supplies (increase AP production) at the start, after your first unit, or ever?
  • How quickly do enemy units begin to flood your way?
  • What types of units are being deployed by the enemy? Humanoid, mechanical, or something else? What are their stats? You can see most units within the game's shop for stat information.
  • Is your deck in an easy to use order?
  • Are the units you have in your deck going to be effective against the enemies in the stage you're aiming for?
  • Would opening up a buff from another level give you a much-needed boost to complete the one you're currently focused on?

Along with the above, you must also make sure you are:

  • Using unit skills as soon as they can reach something your units can't kill quickly with standard attacks.
  • Constantly producing units, or saving for one in particular that will make your job easier.

The hunt for POWs includes a lot of frantic tapping -- both deploying units and setting off skills. Always use skills to kill tough enemy units and break down the enemy base faster. You never want to be sitting and waiting for something to happen.

Units, AP, attack type, and other things to bear in mind

Attack types

When looking at your units in the Customize Units screen, be sure to pay attention to their standard and special attacks' targeting and range.

  • If an attack says single, it will only hit one target at a time. An example of how "one target at a time works" lies in Eri, who's laser special is technically single-target but can hit multiple enemies should they die one by one to her blast.
  • If an attack says spread, it will hit everything in range at once. Tarma is the easiest unit to see how this works, as his shotgun range is short but can do damage to multiple enemies stacked directly in front of him.
  • Each attack or special has its own range, regardless of whether it's listed as long or short in their stats. This means all short attacks will not have the same range, nor will all long attacks. The easiest way to get used to this is by testing out each unit.

Along with all of the above, sometimes it's just better to use cheap, low-power units to wear down the enemy base with specials. As mentioned before, Solider and Rebel Infantry units are valuable assets when seeking POWs because of their cheap cost, fast production, and AoE grenade specials.

If you are at the enemy base and units keep spawning, AoE special attacks will do damage to the enemies as well as to the base itself. This is why units with spread specials are valuable assets when hunting for POWs.

Example strategy for early POW missions

One strategy that has worked for me in several low-level stages is as follows:

  1. Wait until you have 60 AP and send out a Marco
  2. Wait until you have 70 AP and send out Eri
  3. Wait until you have 75 AP and send out Fio
  4. Send out nothing but Soldiers and Rebel Infantry from then on
  5. Use all special attacks as soon as they are available and enemy units are in range

This is a very simple example, but led me to a speedy POW-saving victory time and time again in the first map. You must spam your skills to make this work, and you cannot stop producing Soldiers and Rebel Infantry until done.

Notice I did not mention to upgrade your supplies, which means your AP is locked at your standard accumulation rate. Getting map 1's Marchrius Dennis Rossi (level 1)'s POWs will help you accumulate AP without needing an early supply upgrade. The Development Speed level in the Home Customization menu will help as well. If you absolutely need to upgrade your supply acquisition, do so after sending out your first couple Soldiers/Rebel Infantry.

Sortie Points

Hunting down POWs is very much Sortie Point-intensive. While the most obvious solution to this is to pump money into your Sortie Level in the Home Customization screen, the best course of action is to tackle level 11's Rumi Aikawa POWs. The stages within her level are not too difficult, and if you've been upgrading your Sortie Level, her buff can push your Sortie Points well above 200.

Naturally, you will want to hunt down map 2's level 11 (Madoka Aikawa) for an extra boost later down the line -- but work on Rumi's early on to give yourself some more chances to obtain those POWs.

Never leave a stage without finishing

Pushing through a stage even though you know you won't get a POW can be a downer, but those Metal Slug Points you get for level completion are no joke. Always finish stages to get that money and put it into the units (or Home upgrades) you feel are most needed for the stage you are trying to get POWs from.

Upgrades

Keeping your units up to date with the latest in leveling technology (aka, the highest level available at the time) is a huge help to finishing levels faster, and hence collecting POWs. Aside from this somewhat obvious fact, some Home upgrades are essential as well.

Some Home upgrades are more helpful for speedy completion than others. The most useful are as follows:

  • Sortie Level - This increases your Sortie Points value, and as such is one of the most important to upgrade when you can. That said, the increase from this is best paired with Rumi and Madoka Aikawa's POW buffs.
  • Development Speed - This increases the rate at which you accumulate AP. A must-have, and should be upgraded whenever possible.
  • Production Speed - This increases the rate at which you can put out the same unit in a stage. For example, someone with a Production Speed level of 10 will be able to put out two Marcos faster than someone with a Production Speed level of 2.
  • MSP Gain - This increases the amount of MSP you get per stage, making it easier to upgrade your units and Home. This may not be as important as the three upgrades listed above, but it is still essential to keeping a good pace as you progress.
  • Destruction Bonus - You obtain more AP from killing enemy units as you level this, making it useful but not essential. I let this sit at level 5 for a long time before putting more money into it.

While the other Home upgrades certainly have their uses the ones listed here are the best for POW hunting. You need to get units out as quickly as possible, and the upgrades above are great help with that.

Originally Published Jun. 5th 2014

Associate Editor

Favorite game: Sonic Adventure 2 Favorite word: FAST SLOW ISN'T A REAL WORD



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Comments
  • 1
    Mr. B_1226 1 month ago
    Everyone that has played Metal Slug before knows you get POWs free by "touching" them with your ammo. Go ahead and don't believe me. Go around throwing granades. There is a fixed amount of treasures in the stage. Sometimes one or more are POWs. GIVE ME CREDIT FOR POINTING THIS OUT IF YOU COMMENT THIS ELSEWHERE!!!!!!
  • 1
    HaklePrime_8921 2 months ago
    It's random. You have no control over it. The recent update makes that insanely obvious.
  • 1
    Francisquin 3 months ago
    I do agree that the first time you do an S, options for getting a first POW are high. But 2 things:
    1) This doesn't happen always
    2) You don't need an S to free all the POWS.

    I have freed about a 75% of the POWS in the game, all of the first area, about a 60% of the second and most specials. So I have certain experience on that.

    Furthermore, In the final boss of "friday special" of the "MAP" area (to free the slug copter), I was doing systemathically 1 minute and 4 seconds (typical tank protecting and long range high attack units killing tactic).
    Guess what, I did it 10 times at 1.04 (got 420 sortie points), and at the 10th the POW was freed, no difference at all with other tries. Seems to be random to me.


    Two more things:

    1) The first thing you have to boost is your MSP, this will help you to progress a lot faster.
    2) You didn't even mention the running girl...
  • 1
    9uillo 3 months ago
    It's based on probability; that's why everybody keeps coming up with different theories. The probability thing is briefly mentioned in the official 'help'.

    That said, I might accept that the first, and only the first POW of every stage with more than one POW, are based on performance.
  • 1
    César Dante is chikenboy. César Dante is chikenboy. César Dante is chikenboy. César Dante is chikenboy César Dante is chikenboy. César Dante is chikenboy
  • 1
    jj thing is cheater. and chiken guy.
  • 1
    Mauricio Muñoz Perez is Mr.hung up.
  • 1
    hoopjones 3 months ago
    There is a lot of evidence (personal, and from reading other articles) that the main requirement generally isn't time.

    To make a point, go to one of the Level 2 levels that have 4-6 POWS to rescue when you have rescued none.

    Play the map, do NOT use the metal slug attack OR upgrade your AP raising ability. I almost guarantee that you will get at least one, if not two POW's from this.

    Another theory is to never play a duplicate of a unit to win the map..OR use any special attacks I have seen this work as well.

    In a single area, I did not use the metal slug or special attacks, and I got a POW each and every time. I doubt that is a coincidence.
  • 1
    Anon_4998 3 months ago
    It is definetly not speed, at least not for me. There are times where i end really fast and get S but dont free even one POW, i redo the lvl and get c and released both POW. How the hell it works
  • 1
    clicks_5132 3 months ago
    The first artical I read online about obtaining POWs lead me to beleive there were a series of randomly assigned secret objectives that needed to be fulfilled in order to free the prisoners.

    That got me almost nowhere.

    Now thanks to this artical's insight I'm rapidly unlocking all sorts of bonuses. Some buffoons still cling to the idea that using one unit type or having no deaths in a stage will unlock that one last POW, but from what I've seen now it always comes down to one thing; you just need to be a bit faster.
    Last edited 3 months ago
  • 1
    King30_9673 3 months ago
    Some more I found out. Some unlock with a minimum amount of units summoned (I drop 3 or less). This one is more challenging, but there's a casualty limit for some apparently. I also read a few stages either require the use or disuse of the Sandbag. Another is not using cashed units (Trevor or any you buy with Medals) This last one was still in testing, but I also heard summoning each unit no more than once in a single mission. For that one it was said to just try and summon every unit as a precaution since it might not unlock if you don't sometimes. That's all the ones I know. Hopefully someone can drum up a guide for each stage. Til then I'm just burning Sortie points. XD
  • 1
    King30 3 months ago
    It's true speed works for freeing PoW's in some cases, but not all. There are some where I have S ranks and still have 2 or more to free. It's also about what units you equip, which units you summon, whether or not you use Metal Slug Attack, and if you upgrade your AP speed or not.
  • 1
    Badr_4172 4 months ago
    lol you wrote such a long article when you don't know how to free the POWs
  • 1
    sacier90 4 months ago
    en the las stage of first level, the second pow was release only if i get rank d.... that means lot of time playing the stage.... strange isn't?
  • 1
    Gustavo_1398 4 months ago
    Hello, it didn't really helped. I guess no one knows how to.

    may be speed on finishing the levels?
    May be using power ups all the time?
    May be deploying a lot of units?
    May be not letting units die?

    No one knows.
  • 66
    Ashley SSS 4 months ago
    Associate Editor
    It is definitely speed, but the time limits for each POW are unknown.

    You need to think about the units you're using versus the enemies in the level you're trying to get POWs from. For instance, units with splash damage specials will clear levels with hordes of enemies stuck together than units with single-target specials. You have to figure out the fastest way to clear a level, and hope it's fast enough.

    It'd be a lot easier to give directions if there were a timer in battle, but there isn't one. POW capture is still based on clear speed, though.
  • 1
    Gustavo_1398 4 months ago
    thanks!