Some of the most memorable parts of Kingdom Hearts games have to be the bosses. They show the player a test of strength at the end of each world or when they've achieved a certain amount of strength. Many players can remember some of their favorite in-game bosses as the design and battles are ingrained in their minds.

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This list aims to take on the best boss fights that were brought about in the Kingdom Hearts series. These are the ones that stuck out the most from the 13 titles in the series. Some are part of the main story while others are hidden bosses in the game.

10 Oogie Boogie (Kingdom Hearts)

Oogie Boogie

Oogie Boogie is not one of the most difficult bosses in the Kingdom Hearts games, but he has a unique way of being beaten. Oogie Boogie uses his mechanical roulette wheel of death to deal out the majority of his attack to players. The attacks that he uses are a lot of the time based on the roll of a die which leaves it up to chance.

Figuring out how to navigate an area that's trying to kill the player while also targeting Oogie Boogie is enough of a challenge to keep players entertained. Mastering getting around the area yields big rewards in terms of how engaging the fight can be.

9 Groundshaker (Kingdom Hearts 2)

Groundshaker In Kingdom Hearts 2

The Groundshaker boss is one of the story bosses that is fought in Kingdom Hearts 2. This boss is very fun to fight as it is one of the biggest in the game. The boss is also located in The Pride Lands, so the fight is fought in Sora's lion cub form which grants him fast speeds and quick combos.

The boss consists of a monkey-looking Heartless riding a giant heartless that has two sides to its face. The design is amazing players will have to jump on the giant Heartless' back to do damage to the monkey-looking one and defeat it.

8 The Experiment (Kingdom Hearts 2)

The Experiment Kingdom Hearts 2

The Experiment is another boss that serves as part of Kingdom Hearts 2's story the boss is not the most difficult in the world but the way it looks is the perfect mixture of creepy and cool. It's a terrifying mesh of what looks like cartoonishly decomposed parts of creatures and different robotic contraptions.

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A lot of the time the robotic enemy will try and separate its body parts and if a player tries to do damage to the robot like this a lot of the time their attacks will end badly so the best way to take care of him is putting his body back together with an attack command and then dealing damage.

7 World of Chaos (Kingdom Hearts)

World Of Chaos Kingdom Hearts

The World of Chaos boss battle is huge as it will have players fighting a giant heartless monster. The design of the World of Chaos is Marvelous as it has Ansem protruding from the monster's stomach. This is also one of the few fights where Sora can fly around during its duration as the boss is much too large to be defeated without doing so.

As Sora continues to fight this Heartless it will have different forms that have their specific challenges. Some forms will summons turrets that Sora must take down while another requires Sora to get into its stomach and destroy some parts inside of it.

6 Dark Inferno (Kingdom Hearts 3)

Dark Inferno In Kingdom Hearts 3

Dark Inferno in Kingdom Hearts 3 is an optional boss that can be fought in the Keyblade Graveyard. It is probably one of the sleekest looking Heartless in its design. It's reminiscent of the first Heartless boss in the first Kingdom Hearts game as it has a giant heart-shaped hole in its chest. The horns, tiny wings, and hoof-type feet also give it a captivating demonic look.

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The battle will test a lot of the player's skills as this Heartless is pretty quick and does quite a few attacks that need to be dodged out of the way rather than blocked.

5 Kurt Zisa (Kingdom Hearts)

Kurt Zisa Kingdom Hearts

Kurt Zisa from Kingdom Hearts is named after someone who won a competition that allowed them to have their name as a secret boss in the first Kingdom Hearts game. He has a pretty boss-sounding name that's fitting to this six-armed sand robot serpent creature.

He is difficult to defeat as he has three different forms with different attacks and players will need to understand MP management to beat him. The Boss has a lot of cool design features like a snake head with a diamond in its mouth that needs to be attacked to kill the boss. It's an awesome boss that unlocks a powerful attack with its defeat.

4 Spellican (Kingdom Hearts: Dream Drop Distance)

Spellican Kingdom Hearts 3

Spellican in Kingdom Hearts: Dream Drop Distance is fun to fight as the fight starts with the player grinding a giant rail made of cosmic light. While on this rail the player must dash toward the boss while dodging the different magical attacks that it throws at the player. Once the player manages to hit this boss they will be transported to a different world where they will need to fight Spellican there.

This boss feels as though it breaks space and time as it transports the player to a broken form of the universe after the player's been grinding in it. Both of the areas that the boss is fought in are some of the most gorgeous that Kingdom Hearts: Dream Drop Distance has to offer.

3 Julius (Kingdom Hearts: Dream Drop Distance)

Julius Boss Fight With Riku

The Julius fight in Kingdom Hearts: Dream Drop Distance is one of the most difficult fights in the game, but for one of the hardest fights that the game presents it is nowhere near as challenging as some others that are had in the series. The Julius variation of Pete has a large attack radius and deals out huge damage especially as the fight goes on.

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The fight feels like a big cat and mouse unless players understand how to block and dodge his attacks promptly. The Ultima Weapon Keyblade is also unlocked as a reward for beating him, so he's a boss worth fighting.

2 Yozora (Kingdom Hearts 3)

Yozora Kingdom Hearts 3

Yozora looks somewhat similar to Riku--something that Kingdom Hearts does a lot of--but he has his own way of fighting. He is originally the character from the video game inside the Toy Story world, but this is probably just a world he was trapped in as his shrouded story gives us a bit of insight into the character.

The fight is one of the most difficult in the Kingdom Hearts series, but it is also one of the most rewarding to complete as the fight allows a lot of smooth sense of how to telegraph for well-timed retaliation attacks. The intensity of his attacks as well as the power that they produce gets higher and higher as the fight progresses. It's a great time with a lot of cinematic moments.

1 Master Eraqus (Kingdom Hearts: Birth By Sleep)

Master Eraqus Kingdom Hearts 3

For those that haven't played Kingdom Hearts: Birth By Sleep and want to, they should skip this section as there will be some minor spoilers. The Master Eraqus Boss fight in Kingdom Hearts: Birth By Sleep is a boss fight that is very heavy on the heart as it takes a lot of story development for players to get to this point. The boss fight is challenging as it is the player's Keyblade sensei after all.

Without saying who or why one of the characters confronts Master Eraqus near the end of their story and what they get is a heartbreaking formidable battle. It's the best for what it provides in the series as all the masters that have been fought before were tainted by the darkness.

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