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Attack! (Metal Slug Attack)

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MSA Attack!

Attack! is the primary singleplayer mode of Metal Slug Attack and represents a direct improvement of the Sortie game mode present in Metal Slug Defense. This mode is the main source of EXP (the others being Daily quests and Extra Ops events), MSD currency MSP MSP, Boot Items (all tiers except Platinum), and MSA Unit Part (Single) Unit Parts. It is also the only permanent game mode to consume MSA currency Sortie Points small compressed Sortie Points to play, rivalled only by Extra Ops events.

It is in every player's best interest to advance through World Maps. Every regular (Standard or Elite) mission completed for the first time gives the player MSA currency Medal compressed 30, and boss missions at the end of every region give MSA currency Medal compressed 60. On top of that, every day at 0400 hours server time players are rewarded MSP via the Mailbox for the total number of stages cleared and not currently under attack (World Clear Reward) - MSD currency MSP 70,000 at most.

There is a chance to unlock Special Ops, Extra Shop, Rare Shop, or Rare Boss upon every victory (auto-resolve raids do not count).

Sortie Points

MSA currency Sortie Points

Sortie Points is an automatically renewable resource used in this game mode (and Extra Ops events) to start any and all missions (except the Day Specific Mission). All SP spent are converted into EXP and Guild Points at a ratio of 1:1 regardless of the outcome.

SP regenerate to a certain point that can be extended as the player grows in Level (+1) and buys Sortie Level Upgrades (+2). Capacity can be exceeded with special SP rewards, but SP do not regenerate until brought down below the limit.

There are several ways of obtaining SP:

  • Waiting - MSA currency Sortie Points small compressed 1 every 3 minutes.
  • Completing Daily quests:
    • MSA currency Sortie Points small compressed 60 immediately and for completing 5 and 10 daily quests.
    • MSA currency Sortie Points small compressed 100 for completing 15 daily quests.
  • Levelling up adds MSA currency Sortie Points small compressed 50 plus the amount equal to the past level.
  • Giving a guild mate a Good Job bonus:
    • MSA currency Sortie Points small compressed 15 (they get MSD currency MSP 1,000) for free.
    • MSA currency Sortie Points small compressed 30 (they get MSD currency MSP 30,000) for MSD currency MSP 30,000.
      • Recommended, as one can make more MSP fighting the Rare Boss with that amount of SP while still getting the EXP and MSA currency Medal Battle compressed Battle Medals.
  • Searching for MSA Unit Part (Single) Unit Parts in Treasure Hunt (varies).
  • Purchasing MSA currency Sortie Points small compressed 120 with MSA currency Medal compressed Medals (prices are reset every day at 0400 server time):
    • MSA currency Medal compressed 30 with the 1st purchase.
    • MSA currency Medal compressed 50 with the 2nd purchase.
    • MSA currency Medal compressed 100 with the 3rd purchase.
    • MSA currency Medal compressed 200 with all following purchases.

Standard Missions

For a detailed stage breakdown and free units, see List of Standard Missions (Metal Slug Attack).

Standard missions are fairly easy to beat and offer minimal rewards in terms of MSP and items, but cost less Sortie Points to run, which can be helpful if one needs to empty their Sortie Point pool before going offline.

Depending on how quickly one beats any given level, they are rated S (best), A, B, C, or D (worst), and are given an MSP Bonus (except D) as an extra fraction of the level completion reward. Scoring S allows the player to Raid the mission in question - automatically win it without neither a fight nor a grade bonus (equivalent to having the D grade).

Completion
Rank
MSA rank S MSA rank A MSA rank B MSA rank C MSA rank D MSA rank Defeat
MSP Multiplier
(base value)
0.5 0.3 0.2 0.1 0.0 0.1

The player can save concealed P.O.W.s in the course of playing through a level. In order to do so, one needs to deal a certain amount of damage over a hidden P.O.W. Their locations are scattered throughout the level, so activating special attacks early (before any enemies are in range) can be beneficial. Every saved P.O.W. drops a random Boot Item from the pre-determined loot pool. Automated raids result in a random number of P.O.W.s rescued.

Every boss level completed for the first time grants the player a pre-determined unit for free, which is equivalent of MSA Unit Part (Single) 10 - all units in the list being of Normal rarity.

Every once in awhile [exact times need to be verified] one of already completed missions is considered Under Attack (flashes red) by a random player or NPC deck of the same level, cannot be raided and needs to be taken over again. In this case the player can face much tougher enemies as they would normally do, but receive better loot (than that of the uncontested area - loot tiers scale up with player level, meaning that it is impossible to receive Bronze or Silver after reaching Gold) in full after a successful counter-attack without having to rescue P.O.W.s (pre-battle display does not necessarily match with the amount of items given post-battle). A maximum of 3 stages can be under attack at a time.

Lv.
Req.
Item
Tier
1?
11Bronze
21Silver
31Gold
41

Gold x3

(except for Chicken)

MSA Daily Daily quests offer EXP 120 and MSD currency MSP 10,000 [as of 1.3.0] for completing 1 Standard mission.

Elite Missions

For a detailed stage breakdown, see List of Elite Missions (Metal Slug Attack).

Elite missions are more expensive to run and contain Standard enemy equivalents of higher levels, but offer bigger benefits:

  • MSD currency MSP MSP per MSA currency Sortie Points small compressed SP ratio is higher.
  • Higher tier items are available sooner.
  • MSA Unit Part (Single) Unit Parts can be obtained.

Unable to be contested, each Elite mission can be attempted 3 times a day (refreshes at 0400 server time), although one can buy more attempts with MSA currency Medal compressed Medals.

MSA Daily Daily quests offer EXP 150 and MSD currency MSP 20,000 [as of 1.3.0] for completing one Elite mission.

Day Specific Mission

Every day at 0400 hours (server time) a special boss stage appears and stays open for 24 hours. Players don't spend Sortie Points on fighting the boss but can defeat it only 2 times regardless of difficulty, and no EXP is rewarded. Harder difficulties are unlocked as one's Level reaches certain points and grant bigger MSP and Item rewards:

Difficulty
and
Level Requirement
MSA difficulty 1-Very Easy

Level 01
MSA difficulty 2-Easy

Level 10
MSA difficulty 3-Normal

Level 15
MSA difficulty 4-Hard

Level 20
MSA difficulty 5-Very Hard

Level 30
MSA difficulty 6-Hell

Level 40
MSD currency MSP
(Base)
[as of 1.4.0]
6,000 12,000 18,000 30,000 45,000 90,000

Note: Hell difficulty is called "Ultra Hard" under the difficulty selection.

MSA Daily Daily quests offer EXP 50 and MSD currency MSP 5,000 [as of 1.3.0] for defeating a boss once.

Each day bosses featured in the Day Specific Mission change as item rewards do:

Boss Difficulty / Rewards / Boss HP
MSA difficulty 1-Very Easy MSA difficulty 2-Easy MSA difficulty 3-Normal MSA difficulty 4-Hard MSA difficulty 5-Very Hard MSA difficulty 6-Hell

MON
5,000 8,000 12,000 14,000 16,000 18,000

x2:
MSA item I Handgun.38
MSA item I Handgun.50
x1:
MSA item II Flame Shot

x1:
MSA item II Heavy Machine Gun
MSA item II Rocket Launcher

x2:
MSA item II Heavy Machine Gun
MSA item II Rocket Launcher

x1:
MSA item III Laser
MSA item III Iron Lizard

x2:
MSA item III Laser
MSA item III Iron Lizard

x1:
MSA item IV Big Heavy Machine Gun
MSA item IV Big Rocket Launcher


TUE
5,000 8,000 12,000 16,000 20,000 24,000

x2:
MSA item I Armor Piercer
MSA item I Bomb
x1:
MSA item II Grenade

x1:
MSA item II Molotov Cocktail
MSA item II Thunder Cloud

x2:
MSA item II Molotov Cocktail
MSA item II Thunder Cloud

x1:
MSA item III Mine
MSA item III Stone

x2:
MSA item III Mine
MSA item III Stone

x1:
MSA item IV Big Flame Shot
MSA item IV Red Pepper


WED
8,000 12,000 18,000 21,000 24,000 27,000

x2:
MSA item I Battery
MSA item I Canned Food
x1:
MSA item II Doll

x1:
MSA item II Diploma
MSA item II Teddy Bear

x2:
MSA item II Diploma
MSA item II Teddy Bear

x1:
MSA item III Super Grenade
MSA item III Heart Key

x2:
MSA item III Super Grenade
MSA item III Heart Key

x1:
MSA item IV Big Laser
MSA item IV Magic Lamp


THU
10,000 12,000 16,000 20,000 24,000 30,000

x2:
MSA item I Frog
MSA item I Bread
x1:
MSA item II Poo

x1:
MSA item II Poo
MSA item II Cat

x2:
MSA item II Poo
MSA item II Cat

x1:
MSA item III Enemy Chaser
MSA item III Medicine

x2:
MSA item III Enemy Chaser
MSA item III Medicine

x1:
MSA item IV Big Shotgun
MSA item IV Bird's Nest


FRI
6,000 8,000 12,000 16,000 20,000 24,000

x2:
MSA item I Snake
MSA item I Bone
x1:
MSA item II Blue Jewel

x1:
MSA item II Flame Shot
MSA item II Blue Jewel

x2:
MSA item II Flame Shot
MSA item II Blue Jewel

x1:
MSA item III Drop Shot
MSA item III Yellow Jewel

x2:
MSA item III Drop Shot
MSA item III Yellow Jewel

x1:
MSA item IV Red Jewel
MSA item IV Shield


SAT
10,000 12,000 16,000 20,000 24,000 30,000

x2:
MSA item I Shoes
MSA item I Mouse
x1:
MSA item II Pigeon

x1:
MSA item II Pigeon
MSA item II Monkey Thief

x2:
MSA item II Pigeon
MSA item II Monkey Thief

x1:
MSA item II Doll
MSA item III Diet Pill

x2:
MSA item II Doll
MSA item III Diet Pill

x1:
MSA item IV Red Pepper
MSA item IV Emblem (White)

MSAUnitIron
MSAUnit Fake Rootmars
MSAUnitIronPlate
MSAUnitLevel0
MSAUnitLevel1

SUN
8,000 10,000 12,000 14,000 16,000 18,000

x2:
MSA item I Carrot
MSA item I Chinese Cabbage
x1:
MSA item II Watermelon

x1:
MSA item II Apple
MSA item II Chicken

x2:
MSA item II Apple
MSA item II Chicken

x1:
MSA item III Dumpling
MSA item III Fruit

x2:
MSA item III Dumpling
MSA item III Fruit

x1:
MSA item IV Pig
MSA item IV Chicken

Note:

  • Crablops changes to the second form when its HP is below 30%.
  • Union 01, 02 and 03 have respectively 50%, 20% and 30% of the total HP.
  • Green and Red Emain Macha have respectively 60% and 40% of the total HP.
  • Amadeus Type: α and Amadeus Type: β have both 50% of the total HP.

Rare Boss

MSA Attack! Rare Boss Location

Rare Boss' location.

Within either 1 non-raid victory scored in Standard (including the Day Specific Mission) or Elite worlds, there's a chance (resets in 8 hours after triggering its appearance - best done at the time of Daily quest reset (0400 server time) and 8 hours later) to unlock a special boss stage featuring the Rebel Gigant that costs Sortie Points to play and offers bigger MSP rewards (than Standard and Elite) as well as Battle Medals instead of Item loot. This stage goes away after an hour and can be replayed as many times as one's Sortie Point pool allows (it is recommended to reserve SP bonuses, e.g. from Daily Quests), however with every victory Rebel Gigant's level goes up by one up to 50, and every five victories rewards increase as well as the cost of admission:

Boss
Lv.
Boss
Skills
Boss
Tier
Boss
HP
MSA currency Sortie Points smallx1 MSA currency Sortie Points smallTotal MSA currency MSPBase MSA currency Medal Battlex1 MSA currency MSP/MSA currency Sortie Points smallRatio
1 - 5 0 Iron 6,000 5 25 2,000 10 400.00
6 - 10 0 Iron 7,000 7 60 4,000 20 571.43
11 - 15 0 Iron 8,500 10 110 6,000 30 600.00
16 - 20 0 Bronze 10,000 12 170 8,000 40 666.67
21 - 25 0 Bronze 12,000 15 245 10,000 50 666.67
26 - 30 0 Bronze 14,000 18 335 12,000 60 666.67
31 - 35 0 Silver 17,000 22 445 14,000 70 636.36
36 - 40 0 Silver 20,000 27 580 18,000 80 666.67
41 - 45 0 Gold 25,000 35 755 22,500 90 642.86
46 - 50 0 Gold 30,000 45 980 30,000 100 666.67
Metal Slug Attack
Game Modes Another StoryList of Story Stages | Attack!List of Standard MissionsList of Elite Missions | Battle and Team Battle | Combat School | Extra OpsList of Extra Ops Stages | Online | P.O.W. Rescue | Special Ops
Features Level and EXPVIP | Build UpUnitsby IconTeamsStatsItems | GuildList of Guild Raid Stages | Daily LoginDaily QuestsEvents | Power-Ups | Mystery CrankTreasure Hunt | Shops
Extras Patch Notes

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