Metal Slug Infinity/Slugs

Currently owned Slugs list.

The Slugs submode in Metal Slug Infinity is where the player can improve their Slugs' stats and acquire more of them.

Information

Alongside Regular Army vehicles, every unit is able to ride Rebel, Ptolemaic, and Alien machinery regardless on the size of the vehicle or pilot. Units can also ride large mutants such as the Giant Caterpillar. Slugs can be any of the three elemental types (Physical, Flame, and Lightning). The unit and Slug's paired Battle Point increases when both are from the same force (e.g. Marco and SV-001; Mortar and Di-Cokka) and same elemental type.

Slugs are leveled up using Data Chips. Just like units, Slugs have ability milestones achieved by reaching their respective level. All milestones are available to be unlocked, however the Slug's level limit starts out way too low. The player increases the Slug's level limit by using Quark to enhance Slugs and promoting the Slug to a higher grade to increase the enhance limit.

Data Chips are earned through the Slug Camp. Here, ten Slugs fight against various units and vehicles as they attempt to destroy the main target. Slugs with a visible pilot are driven by the goggle-wearing Rebels who fly the R-Shobu. Entering a battle uses a Slug Camp Ticket; losing a battle does not waste a ticket. Up to ten tickets are reloaded for free each daily reset.

Unlike the units, the Slugs do not reset their level upon Returning. Any used Data Chips are returned back to the player for merged and dismantled Slugs. Data Chip rewards are increased by leveling up the Data Chip Research Institute, increasing an Artifact's grade, or by leveling up specific War Books.

Note that assigning a Slug to a unit increases that unit's stats even when the Slug is not being actively ridden. The Slug's stats act as a multiplier, so it's most effective to pair vehicles with units that have similar strengths. For example, matching a Slug with a high health stat (e.g. SV-001 Type-R) with a unit with a high health stat (e.g. Fat Tarma) will result in a very tough unit.

As the player can own multiple copies (needed for promotion), there is a limit on the number of Slugs held. The player cannot open any more Slug Boxes or go into Excavation Sites when the hangar limit is reached. They can increase this limit by ten using Gems with each upgrade rising in cost.

Rarities and Promotion

Slugs come in four rarities: N, R, SR, and SSR. Normal Slugs are weaker or battered variants of higher rarity Slugs. Slugs can be merged (called Promotion) to increase their grade (stars); merging a 5-star N Slug turns it into a 6-star vehicle that is either an R (most likely), SR (unlikely), or SSR (very unlikely). Slugs can be promoted as long as all three are the same Slug and grade. A variant of 5-star Slugs called EX Slugs (either bought, rewarded, randomly excavated, or randomly promoted from a 4-Star Slug) can be used when merging regular 5-star Slugs of any type. Combining multiple EX Slugs increases the probability of getting an SR or SSR Slug.

Similar to an EX Slug, an item called the Power Pack can substitute a needed SSR Slug of the same grade for promotion. Power Packs take a slot in the hangar and costs 30 Infinity Quarks in the Infinity Store.

Merging N Slugs gives out a random Slug and elemental type. R, SR, and SSR Slugs do not change into other Slugs, and the elemental type a merged Slug comes out is based on the first Slug selected for promotion. The elemental type can be changed by using a Slug Converter Kit found in the Infinity Store for 20 Infinity Quarks. N Slugs can be merged for free; the other Rarities require Gems to merge.

Merging Cost

Grade	R	SR	SSR
	100	300	1000
	200	600	2000
	300	900	3000
	?	?	4000

R, SR, and SSR Slugs can be dismantled to receive Quark, which is used to enhance Slugs. SRs and SSRs additionally provide Infinity Quark, which allows direct purchases of SSR Slugs, Power Packs, and Slug Converter Kits in the Infinity section of the Slug store.

The maximum level of a Slug is determined by its grade, rarity, and enhancement level. Furthermore, grade and rarity determines the maximum enhancement level as well. SSR Slugs are hence significantly more valuable than SR and R Slugs, as not only are their base stats higher, their level can be increased much further.

Slug Enhancement

LV.	R	SR	SSR
1	4	6	8
2	7	11	16
3	11	16	23
4	14	21	30
5	17	26	37
6	20	31	44
7	?	35	51
8	?	40	58
9	?	45	65
10	?	?	72
11		?	78
12		?	85
13		?	?
14		?	?
15		?	?
16			?
17			?
18			?
19			?
20			?

The chances of obtaining R / SR / SSR Slugs from a 5-star N merge varies depending on the number of EX Slugs used:

EX Slugs	R%	SR%	SSR%
0	90%	9%	1%
1	70%	27%	3%
2	0%	90%	10%
3	0%	75%	25%

Always merging 3 EX Slugs at a time averages the most SSRs per EX Slug used, even when factoring in SRs dismantled for Infinity Quark. Merging pairs of 2 EX Slugs is not quite as efficient, however, it allows for more Infinity shop purchases - and since such purchases aren't randomized, they can allow for much faster short-term player advancements.

Players interested in long-term advancements should never dismantle SSRs.

Excavation Site

Aside from Slug Boxes, N Slugs and rarely EX Slugs are earned by the Excavation Site. Excavating a site uses every respective ticket available as long it doesn't exceed the player's Slug limit. Certain units can increase the Excavation Site's max ticket account by one once they reach a certain grade.

Excavation Site	Slug Grade Chance	Single Ticket Recharge	Soldier	Grade per Ticket
General	60% 25% 15%	(Before): 30 Minutes (2021-6-3): 5 Minutes	Arabian Soldier
			Tiny UFO Type-A
			Zombie (Fattish Man)
			Bazooka Soldier
			Ring Laser Mecha
			Hyakutaro
Advanced	75% 25%	(Before): 2 Hours (2021-6-3): 20 Minutes	Smasher
			Trevor
			Invader
			Rebel Infantry
			Vanguard
			Madoka Aikawa
Expert	60% 40%	(Before): 6 Hours (2021-6-3): 1 Hour	Nadia
			Mortar
			Marco-H
			Rocket Bomb Soldier
			Assaultpeng
			Leona

List of Slugs

SSR

These Slugs can be leveled and enhanced beyond any others. Think very carefully before dismantling them - they're seldom awarded, and all types have their strengths.

SV-001	Mars Box	Space Tank (X-Mas)	Rudolph Donkey	Iron Cab
Slug Copter	Sarubia (PM)	Sasquatch	Rebel Gigant	Giant Caterpillar
Slug Mobile	Ptolemaic Slug (V)	Big Snail	Invader UFO	Tripod
Ostrich	Donkey Carriage	Protogunner	R.R-Shobu	Iron Nokana (Another)
Iron Nokana (Rebel Army)	Iron Nokana (Regular Army)	MG Unit	Drill Slug	Giant Hunter Walker
Bradley Slug	Pumpkin Head	Redback	Felsteed	Crab-Tank
Space Tank	Seahorse Slug	Metal Duck	Turtle Slug	Hi-Do
Slug Gunner	Black Hound	SV-Camel	Slug Flyer	SV-001 Type-R
Dai-Manji	LV Armor	Elephant Slug	Mars Mecha	Shoe

SR

Stronger vehicles than Rs, although ultimately it's safe to dismantle them for Infinity Quark once enough SSRs have been collected.

Iron Iso	Nop-03 Sarubia	Slugnoid	Parachuetruck	Metal Claw
R-Shobu	Mini U.F.O

R

Low-value vehicles that can be redeemed for some amount of Quark.

MV-280B	Melty Honey	Donkey Slug	MH-6 s (PM)	MH-6 s
Girida-O (PM)	Bradley	Girida-O	Hover Vehicle	Di-Cokka (PM)
Di-Cokka	Hover Unit	Bradley (PM)

N

Although these are damaged vehicles with very poor battle abilities, they have the potential to evolve to R / SR / SSR forms after repeated merges.

Battered MV-280B	Battered Di-Cokka	Battered Girida-O	Battered MH-6 s	Battered Bradley
Battered T-2B Melty Honey	Battered Bradley Ver.P.M	Battered Mini U.F.O	Battered Hover Unit	Weak Donkey