Metal Slug is not for the faint of heart. This is especially true if you played this
series in the arcades where each of your three lives count. When you have no life bar and getting hit
once means instant death, things can become quite stressful. But nothing will put your nerves to the test
like the bosses of these games. These monstrous war machines are designed
to stop your progression and empty your wallet. With so many installments, Metal Slug had
a lot of nightmarish bosses that are forever stuck in our memories. Now remember, this is a subjective list based mostly on my own experience. These are the bosses that I had a hard time
fighting them. You may have a different opinion, and I'm sure there are those who could defeat
these monsters blindfolded while holding the controller with their feet. Also, I'm including bosses from the main games
only. With that out of the way, here's the top ten
hardest bosses in Metal Slug. Allen O'neil is a recurrent sub boss in the
Metal Slug series. He is a relentless officer in the rebel army who no matter how you kill him in one game, always comes back for the next. In some games, he is presented as a fully
fledged boss though. And one of these times is his presence in
Metal Slug 4. The second boss of the 4th installment puts you against an armed tower operated by
many soldiers under the command of O'neil. The tower is composed of 5 sections and you'll have to destroy them one by one before you could deal with the bald officer
at its top. The difficulty of this boss resides in the
fact that each section has its own weapons and
patterns to memorize. And just when you start to learn how to avoid
its attacks, the section is destroyed and the next one
comes down forcing you to change your position and strategy. You also have to deal with two sections at
a time. And depending on what you've destroyed, some combinations of these levels can really
mess you up. At the top of the tower, you'll find O'neil in charge of a giant cannon
and parachute bombs. While the bombs are not very difficult to
avoid, the heavy shells launched by the canon are
very fast and will most likely get you if you're not
careful. With the destruction of the last section,
O'neil dies... again. But later in the game you'll learn that he
wasn't even the real one. The level 4 in Metal Slug 5 takes place for
the most part under water. So it's not really a surprise that the boss
of that level is a sub marine, right? Wrong, It's a sand marine and you fight it
in the middle of a desert. Admittedly, the sand marine doesn't have a
lot of attacks. It's main weapon is the multiple canons on
its top that launches a volley of fire balls that fall on the player. Since the boss sinks and emerges from the
sand constantly, the player will find themselves on top of it most of the time. Mostly due to the fact that the sand marine's
size takes most of the screen. That makes dodging the fire balls trickier
since you won't have enough time to react to their trajectory. Should you choose to get off of the boss,
you will have very little room to move and most likely corner yourself. In addition, the sand marine will use its
front canon and rockets to shoot you. But thanks to the sliding feature present
Metal Slug 5, you can manage to dodge the boss's attacks effectively. Though in my case, I was more lucky than skilled
to be honest. Next entry is also a fourth boss, this time
from Metal Slug 7 / XX. A monstrous machine will ambush you once you
arrive at the end of the level, starting a long climbing up the water fall, Hence its
name; Fall Mecha. With the bridge destroyed and no other platform
to use, you can only take advantage of the boss itself to stand on. Since it's always below you, you have no choice
but to jump and shoot downward. The Mecha attacks by throwing plasma projectiles
which are not very difficult to evade, and every so often, it shoots a huge laser beam
that can only be avoided by jumping on one of the boss's limbs. Two prisoners are waiting for you on the said
limbs and provide much needed weapons. However, the most aggravating part of this
fight are the super annoying turrets hiding in the fall. They will come out from their hideout more
often than you'll like and ruin your life by shooting different kinds of projectiles. There is a way to tell what kind of attack
they'll use, but even then, it's still very difficult to not get hit when you have so
little room to move. Once it sustains enough damage, the Fall Mecha
will launch a final laser beam shot that instead of killing you, will send you right to the
next level. Let's stay with Metal Slug XX and with another
encounter with good old Allen O'neil, the real one this time. After they've been saved by their future counterpart,
the rebel army found themselves in possession of some neat weaponry using cutting edge technology. One of these fearsome weapons was a mech designed
specifically for O'neil, the Rebel Gigant. The main strength of this boss is its high
speed and agility despite its size. The Rebel Gigant has many tools at its disposal. It can launch multiple homing missiles and
floating mines that can easily overwhelm the player. Its most dangerous attack in my opinion is
its fast rockets that the Mech throws from its left limb. Whereas the right limb has the shape of a
claw and used to deal devastating close ranged damage. Occasionally, O'neil jumps off screen and
charge at the player with full speed. The only thing that can stop him is a well
timed canon blast. What makes this fight difficult is the fact
that the player is forced to use a giant Mecha themselves with no possibility to leave it. And since this is the first time in the series
where we're using such tool, it can take some time before getting used to it. But God this fight is epic. This one is peculiar. It's not connected to the rebel army, the
Mars people or to any main villains of the series. But still manages to be the most hated bosses
in Metal Slug. Sol Dae Rokker, let's just call it Sol, it's
shorter, is the level 4's boss in Metal Slug 3. It's a deity charged to protect the ruins
where the Regular and Rebel armies fought. And because of all the destruction they caused,
Sol got angry and started attacking anybody on sight. But in truth, you won't see it attacking anybody
besides you. Sol looks like a giant face with a red orb
on its forehead, which is also its only weak point. It continually floats above you and attacks
using different tools. It has two types of energy beams, the yellow
ones and red ones. Contrarily to all video games clichés, it's
the yellow beams that you should be afraid of. their pattern is random, and you will most
likely get cornered and hit by them. The boss can also create what looks like spirits
shaped like wolves that explode upon impact. Although they are not difficult to avoid,
since they don't attack immediately and keep flying for a while first, I tend to forget
about them, and get hit anyway. Finally, it can shoot a purple beam from its
mouth which you can avoid by running to the edge of the tower. The thing that hate the most about this boss
is how you can't use your grenades against it. Its weak point is so high up, they'll never
reach it. So the strategy of taking advantage of the
temporary invincibility after dying to shower a boss with grenades, won't work here. Also the more damage it takes, the faster
sol's attacks get. Just perfect. Brain Robot is the 3rd boss of Metal Slug
6, and just as the name implies, it's a giant robot controlled by a brain with eyes stuck
on it. This abomination starts chasing you when you
get deep in the sewers. If you get too close, the robot uses its claws
to hit you. Staying far is not safe either. The Robot will occasionally throw vehicles
at you, and shoot homing electricity projectiles from its brain. Its torso can open to send a wave of electricity
balls that are pretty hard to dodge. Taking advantage of the sewer water, your
enemy will create a wave of electricity that can only be avoided by standing on one of
the creates present during the fight. Once it takes too much damage, Brain Robot
goes berserk. It violently swings its arms giving you lesser
room to move while continually shooting electricity balls. You do have a vehicle during this boss fight,
the Protogunner. However it won't offer you any protection
and unlike with the Giant Hermit in Metal Slug 3, it doesn't move in reverse. Which means you'll have to constantly readjust
your aim while staying far from the boss. Adding more stuff to worry about when fighting
this super frustrating boss. The fourth place is reserved for Metal Slug
4's main antagonist, Amadeus. The mad scientist used his genius to invent
a computer that, in addition of taking control over all military systems in the world, was
on itself a monstrous war machine. The fight is divided into three phases where
Amadeus operates one of the three parts that constitute the computer. The first obstacle is fairly easy. The machine launches rockets that are not
hard to avoid, and attacks using its claw if you stay too close to him. The most challenging part during this phase
is the circle-like lasers that he throws at you. They can be tricky to avoid. Once destroyed, Amadeus switches to the next
part of the machine, which is also not that difficult to deal with. I would say it's even fun learning the patterns
of its attacks. But all fun ends with the third and last phase. You know it's a final boss when you have to
deal with B.S attacks, like those screen filling lasers, and the purple rings that I still
can't figure out how to dodge it. Those ones are cool though. I enjoyed learning how to avoid them
It's worth mentioning that the fight ends with Amadeus's fate remaining uncertain. Seeing him in a future game with a new crazy
invention is still a possibility. The third place is reserved for Metal Slug
3's main antagonist, the handsome leader of the Mars people, with a cute angelic laugh,
Rootmars. The final mission of Metal Slug 3 is almost
as long as the entirety of MS 1. As a result, you get to fight three mini bosses
before the last showdown. One of them put you against the mother brain
of the Mars people. And although that fight is pretty though as
well, Especially when you have to evade those gigantic energy balls, it's the final dual
against Rootmars that we are going to focus on for this entry. When you get ejected from the spaceship after
triggering its self destruct mechanism, you'll find yourself in a long free fall inside the
Metal Slug. However, the mastermind of the Martians catches
you in a last attempt to take you down with it. Since your vehicle is within the boss's grasp,
it's obvious that you have no way of moving with it. Not that you can move in the first place,
you are falling from space after all. But the Metal Slug still plays a major role
in this fight with its fire power and the invincibility frames it allows you when you
leave it. Should you lose the Slug, as it was the case
with me, the fight will be a lot tougher. Rootmars has two attacks. A wave created by its brain that you can jump
over, but the timing is not very obvious, and the second attack is in the form of a
pack of green orbs that Rootmars spits with its mouth and hit you from bellow. Needless to say that you have very little
room to move, you are fighting on the top of the boss's head. Your partner will come to help you eventually,
but I find him more distracting that helpful since his laser shots have the same color
as Rootmars green orbs. And his aiming sucks! The 2nd place is reserved for Metal Slug 2's
main antagonist (are you starting to see a pattern here), the gigantic mothership of
the Mars people, Rugname. After defeating the smaller spaceship Dai-Manji,
The big boss makes its appearance and fuses with it. Rugname has only two means of attack. A large laser beam shot from the center, which
is pretty easy to avoid, and the deployment of the many UFOs which is by far the most
annoying thing to deal with in this battle. Their attacks and movements are completely
random, the trajectory of their lasers is unpredictable and you will get cornered. Rebel soldiers will come to assist you but
you shouldn't relay too much on their help. They will however bring you a Metal Slug to
use, which can be super helpful, if you manage to keep it long enough that is. I remember the first time I saw this boss
in the arcades, one skilled guy was playing the game and managed to make all the way to
the this point with one life only. He thought he had beaten the game when he
took down the Dai-Manji. But, Oh boy he was wrong! His skill didn't help much when he started
losing all his remaining lives and quarters against the real final boss. The other guys who were watching lent him
their own quarters and even then he couldn't beat this cursed spaceship. God bless the power of the infinite continues
of the console version. Before getting to the number one spot, here's
some honorable mentions. And the number 1 place is reserved for the
Original Metal Slug final boss, just Kidding. Hah! What a twist! Actually none of the first game bosses is
really hard. The hardest boss in the entire series in my
opinion is also the last one introduced to it. The Kraken from Metal Slug 7 / XX. This entry is a kind of a compilation of what
made the previous bosses difficult. You first have to fight its first phase, where
the boss uses its six tentacles that you have to destroy one by one. Since the fight takes place on a volcano,
the Kraken hides its limbs under the lava to surprise and hit you from bellow. You need to carefully jump on the scrap metals
to avoid its attacks. The tentacles will toss scraps at you, try
to smash you , rotate to destroy the platforms you're standing on and throw plasma projectiles
and boulders of Margma with random trajectory. Once you beat all the tentacles, the real
fun begins. The main body of the Kraken flies and starts
attacking with everything it has, and it has a lot of enraging attacks. There is its giant shell that bounces once
before it leaves you alone. It will drop a pack of Magma balls that are
a real pain to dodge. Deploys these spheres that take forever to
destroy and will kill you if touched. Throws big cylinders to crash you and small
ones that will follow you to the edge of the screen. Dive into the lava creating a wave of the
burning liquid, sends sensor mines to destroy the platform you're on, and merges violently
taking with it whatever it was on its way. Oh and I forgot, since the boss is flying,
you can't reach it with grenades. I can't think of a single feature that annoyed
me in previous battles that is absent when fighting the Kraken. And that's why it's my number one pick for
the hardest boss in the Metal Slug series. That was my top ten hardest bosses in Metal
Slug. Which one of these hellish war machines made
you pull your hair out of frustration ? Or do you have your own Nemesis? Share your answer with us in the comments. Special thanks to my patrons for their generous
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