Build Up

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Build Up in Metal Slug Attack is the equivalent of Metal Slug Defense's Customise menu. Here a player can upgrade their Base and Units as well as setting up their decks for a fight.

Customize Unit

This menu is dedicated to improving individual Units' Stats. There is a good number of ways of doing so, each with their own requirements and benefits. In this menu units are sorted by several criteria (cannot be changed, but can be filtered by faction):

• Ownership status (whether the player has it unlocked).
• Level.
• Number of skills unlocked ("released").
• Evolution tier.

Evolution

Units can use up corresponding parts to Evolve to the next tier (represented by the frame around a unit's icon: Iron -> Bronze -> Silver -> Gold -> Platinum). Every time a new tier is reached base HP and Attack Damage are multiplied by 1.1 (see the table below), additionally the AP cost is reduced by a constant value (for that unit).

Tier		Parts Required		Total Base HP and Attack Damage
I	Iron	10	(10)	1.0	(1.10)
II	Bronze	20	(30)	1.1	(1.11)
III	Silver	50	(80)	1.21	(1.12)
IV	Gold	100	(180)	1.331	(1.13)
V	Platinum	150	(330)	1.4641	(1.14)

Certain units have a 1.3x multiplier instead of the usual 1.1x:

• Elephant Slug (Battery)
• Christmas Fio
• Deformed Slug Gunner
• Rugname X

Valentine Nadia has a 1.53x multiplier for her first two evolutions, and the usual 1.1x for the two after. Big Shiee does not gain health when evolved at all.

Aside from HP and Attack Damage, some units' Resistance is affected by Evolution:

• Marco (+3)
• Tarma (+4)
• Eri (+2)
• Fio (+2)
• SV-Camel
• Loretta (+10)

A unit starts evolved to a specific tier (stat bonuses included, except AP cost reduction for most units) depending on its Rarity (the number of parts needed to unlock it):

Rarity
Parts Required	10	30	80
Starting Tier	I - Iron	II - Bronze	III - Silver

Certain rare units do have their AP costs decreased when unlocked - the initial cost listed in the units' card goes down immediately. Some are:

• Ring Laser Mecha - from 130 to 123.
• Ohumein-Conga (Red) - from 210 to 200.
• Morden Robot - from 140 to 133.

Red Eye is not awarded an AP discount when evolving from Bronze to Silver.

Equipment

Items can be put into Equipment Slots (cannot be unequipped) for a permanent stat increase that is affected by Skills unlocked and levels of the latter. Items required differ greatly among units, as do corresponding effects. After filling out all 6 equipment slots a skill can be unlocked ( Released as the game puts it), providing either special attacks, effects, or a stat increase. Effects from items required by previous skills remain and stack with each new set. The amount of skills unlocked is represented by stars under a unit's icon.

Skills

Skills are the power-up enhancers of every units the game. Unlike Metal Slug Defense's level up. Skills can be found in the units tab on the right side.

Skills in turn can be upgraded for MSP via Skill Strengthening ^{(Called "List of Skills" pre-1.6.0)} (not higher than the unit's current Level past Level 10) and provide with a marginal increase in effectiveness. Costs of each level linearly increase depending on which skill it is:

• Skill 1 - 500.
• Skill 2 - 1,000.
• Skill 3 - 3,000.
• Skill 4 - 5,000.

Levelling Up

MSP can be spent on Powering-Up that increases a unit's Level by 1 (represented by the number under a unit's icon, and not higher than the player's current Level past Level 10) and increases HP and Attack Damage by a constant fraction of the original value, every 10th upgrade adding the double of that fraction:

Lv.	Increment (fraction of the base value)	Multiplier (base value)
1	×	1.00
2	1 / 20	1.05
3	1 / 20	1.10
4	1 / 20	1.15
5	1 / 20	1.20
6	1 / 20	1.25
7	1 / 20	1.30
8	1 / 20	1.35
9	1 / 20	1.40
10	2 / 20	1.50
11	1 / 22	1.55
12	1 / 22	1.59
13	1 / 22	1.64
14	1 / 22	1.68
15	1 / 22	1.73
16	1 / 22	1.77
17	1 / 22	1.82
18	1 / 22	1.86
19	1 / 22	1.91
20	2 / 22	2.00

With most units, every 10th level sees a total HP / Attack Damage increase of 50% of the base, however there are exceptions:

• R-Shobu Ver. P.M. - additional 100% of Short (Near) Attack Damage.

• Sasquatch - additional 25% Resistance.

• Nop-03 Sarubia additional Resistance(+1) for each level.

Customize Deck

Players are given 3 decks to organise battle groups with. Up to 10 units can be in one deck at a time, plus a unit for hire (for MSP) provided by one of the Guild members (if the player is in a guild) that is selected before a mission. If a deck if made with units exclusively from a single faction, they all receive a +10% HP bonus.

More decks can be bought with medals; this is typically not recommended as the medals can be used for other purposes.

Customize Bases

Players can upgrade various stats that affect their effectiveness as a whole, regardless of deck composition. Every upgrade thread cannot exceed the player's Level (past Level 10) and costs progressively more to move up.

Sortie Level

Increases Sortie Point storage capacity by 2 with every upgrade (stacks with capacity bonus from the player's Level). Useful for players that cannot spend accumulating SPs in time before they exceed storage capacity.

Base Level

Increases the base's Health Points. It starts with 3,000 HP at level 1 and each upgrade adds up 500 HP. Since the version 2.10.0, the base's Health Points has been increased drastically and will be increased further in version 3.16.0. A somewhat important upgrade.

Level	HP
1	11,800
10	28,000
20	46,000
30	64,000
40	82,000
50	100,000

Version	Initial ~ 2.9.1	2.10.0 ~ 3.15.0	3.16.0
Initial Health	3,000	11,800	17,700
Health Incr.	500	1,800	2,700
Max Health	27,500	100,000	150,000

Development Speed Level

Increases speed at which the player generates APs in combat. It is an extremely important upgrade when battling, as it will increase the speed of how fast your base will generate AP, which in turn will determine how fast you can deploy units. The player starts at normal AP production speed (based on their AP production level). There are 12 upgrades, with each upgrade increasing your AP production by 50%, which stacks up to 600% of your AP production level.

Level	AP/sec
1 - 4	6
5 - 7	7
8 - 10	8
11 - 14	9
15 - 17	10
18 - 20	11
21 - 24	12
25 - 27	13
28 - 30	14
31 - 34	15
35 - 37	16
38 - 40	17
41 - 44	18
45 - 47	19
48 - 50	20

Hangar Level

Increases how many APs the player can store while in combat. The player starts off with an initial limit which is based on how developed their Hangar Level is. This also stacks with the AP production upgrade in a battle, so the higher your hangar level is, the more AP you can store at any given time. Each on-site upgrade increases the max amount of APs you can hold at any given time by 50% of your Hangar Level. There are 12 of these upgrades, at that level, players can store up to 600% of what their Hangar Level can hold at level 1. Prior to the 1.6.0 patch, the maximum amount of AP that could be stored was 9,999.

Level	AP stock (LV00)	AP stock (LV10)
1	100	600
2	150	900
3	200	1,200
4	250	1,500
5	300	1,800
10	550	3,300
20	1,050	6,300
30	1,550	9,300
40	2,050	12,300
50	2,550	15,300

Production Speed Level

Fairly important in battles, as increased production levels means a unit can be quickly redeployed again after being sent out to battle.

Level	Multiplier	Level	Multiplier
1	1.00	26	0.75
2	0.99	27	0.74
3	0.98	28	0.73
4	0.97	29	0.72
5	0.96	30	0.71
6	0.95	31	0.70
7	0.94	32	0.69
8	0.93	33	0.68
9	0.92	34	0.67
10	0.91	35	0.66
11	0.90	36	0.65
12	0.89	37	0.64
13	0.88	38	0.63
14	0.87	39	0.62
15	0.86	40	0.61
16	0.85	41	0.60
17	0.84	42	0.59
18	0.83	43	0.58
19	0.82	44	0.57
20	0.81	45	0.56
21	0.80	46	0.55
22	0.79	47	0.54
23	0.78	48	0.53
24	0.77	49	0.52
25	0.76	50	0.51

Destruction Bonus Level

Increases the amount of AP that is gained when killing enemy units. Important in prolonged battles.

MSP Gain Level

Improves MSP rewards gained from completing missions. It starts with a multiplier of 1.0 at level 1 and each upgrade increases the multiplier by 0.1. MSP rewards determined by completion rank (how fast a level is beaten) are not affected.

Level	Multiplier
1	1.0
2	1.1
3	1.2
4	1.3
5	1.4
10	1.9
20	2.9
30	3.9
40	4.9
50	5.9

Metal Slug Attack Level

Increases strength of the charging self-destructing SV-001 command power. ^{[Super Metal Slug Attack x3 effect to be reflected.]}

It is rarely used by high level players, as it provides very little effects for them. Apart from dealing very little damage (though it can kill low health units with ease), it is also capable of knocking back any unit it hits if they are not killed by it. When hitting the base, the damage is reduced to 26.64%.

Version	Initial ~ 2.7.0	2.8.0 ~ current
Initial Damage	?	5,000
Damage Incr.	?	1,000
Max Damage (base)	?	14,385
Max Damage (units)	?	54,000

Note: the damage calculation use the normal resistance (100% damage taken) for any unit.

Metal Slug Charge Level

Speeds up recharge of the said command power.

Level	Time (frame)	Time (sec)
1 - 2	2500	83.33
3 - 4	2326	77.53
5	2174	72.47
6 - 7	2000	66.67
8 - 9	1887	62.90
10	1786	59.53
11 - 12	1667	55.57
13 - 14	1588	52.93
15	1516	50.53
16 - 17	1429	47.63
18 - 19	1370	45.67
20	1316	43.87
21 - 22	1250	41.67
23 - 24	1205	40.17
25	1163	38.77
26 - 27	1112	37.07
28 - 29	1076	35.87
30	1042	34.73
31 - 32	1000	33.33
33 - 34	971	32.37
35	944	31.47
36 - 37	910	30.33
38 - 39	885	29.50
40	863	28.77
41 - 42	834	27.80
43 - 44	814	27.13
45	794	26.47
46	800	26.67
47	770	25.67
48 - 49	752	25.07
50	736	24.53

Recovery Charge Level

Speeds up recharge of recovery. When activated, it will heal all units back to 100% health, and allows the player to immediately redeploy the same units again without waiting for cooldown. Often used with powerful units to overwhelm the enemy.

Level	Time (frame)	Time (sec)
1 - 6	???	???
7	2667	88.90
8	2475	82.50
9	2500	83.33
10 - 12	2326	77.53
13 - 14	2174	72.47
15 - 16	2000	66.67
17 - 18	1887	62.90
19 - 20	1786	59.53
21	1667	55.57
22	1550	51.67
23	1559	51.97
24	1493	49.77
25	1588	52.93
26 - 27	1516	50.53
28 - 29	1429	47.63
30 - 32	1370	45.67
33 - 34	1316	43.87
35 - 36	1250	41.67
37 - 38	1205	40.17
39 - 40	1163	38.77
41 - 43	1112	37.07
44 - 45	1076	35.87
46 - 47	1042	34.73
48 - 49	1000	33.33
50	971	32.37

Reload Charge Level

When used, it will immediately recharge all unit's special attack bars regardless if they are filled or not. Often used with units that are utilised for their special attacks.

Lv.	Time (frame)	Time (sec)
1	???	???
2	???	???
3	???	???
4	???	???
5	???	???
6	???	???
7	???	???
8	???	???
9	???	???
10	???	???
11	???	???
12	???	???
13	???	???
14	???	???
15	493	16.43
16	479	15.97
17	470	15.67
18	455	15.17
19	443	14.77
20	431	14.37
21	???	???
22	412	13.73
23	400	13.33
24	390	13.00
25	381	12.70
26	371	12.37
27	367	12.23
28	358	11.93
29	350	11.67
30	342	11.40
31	334	11.13
32	331	11.03
33	323	10.77
34	317	10.57
35	310	10.33
36	304	10.13
37	299	9.97
38	295	9.83
39	290	9.67
40	284	9.47
41	278	9.27
42	276	9.20
43	271	9.03
44	266	8.87
45	260	8.67
46	257	8.57
47	255	8.50
48	250	8.33
49	247	8.23
50	243	8.10

Costs

Lv.
2	1,000
3	2,500
4	4,000
5	5,500
6	7,000
7	8,500
8	10,000
9	11,500
10	13,000
20	28,000
30	43,000
40	58,000
50	73,000