King Boo's Revenge X is a ROM hack made by thebloody7 and released in May 2020. It is the sequel to King Boo's Revenge 2, and of the King Boo's Revenge series.
In contrast to the 2 previous installments, this hack offers 160 Stars, new aesthetics and twisted challenges combined, all to be made in a harder difficulty. Additionally, the Vanish Cap gets an ability upgrade called the "Quicksand Cap", which lets the player walk on the quicksand for a short period of time, while still being able to pass through walls.
Also, it contains fewer red coin Stars as a reward by reaching the pipe at the end of the key boss levels, as well as hidden 100 coin Star boxes (as Star 7) to make the game's length more straightforward.
A belated update of the hack was released the following year called King Boo's Revenge X FREE, this edition slightly improves the hack by adding checkpoints reserved for difficult parts in every stage and other small changes.
Plot[]
King Boo has suddenly disappeared and Mario is off to find him while he's on a journey discovering the mysteries of his realm.
Courses[]
All the main courses (excluding King Boo courses) are requirement-free so they are accessible at any time.
| Name | Notes | Image |
|---|---|---|
| Mystery Mansion | Consuming Void Trial is located inside this level. | 
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| Stormy Oceanic Town | 
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| Sand Fusion Cavern | 
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| New King Boo's Prison | Whether or not it is coincidental, this level is an inspiration of Boo's Private Jails from the first game. | 
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| Flowery Flower Field | 
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| Crazy Stirring Cocktail | 
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| Peaceful Jingle Jungle | 
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| Invasion Forestial | 
| |
| Mirage Trees | 
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| Station 616 | The level name is a reference to Ap616 (SM64 ROM hack player) hence the number. | 
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| Mistic Mist's Revenge | This level is the direct successor to Mystical Mist Madness from King Boo's Revenge 2 due to the usage of mist faking the terrain with quicksand. | 
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| Poisonous Hollows | This level is created by sizzlingmario4, who is best known for his work on King Boo's Revenge 2. | 
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| Heatwave Canyon | This level has a closer visual approach to two levels in the first King Boo's Revenge; those being Exotic Danger and Forbidden West World. | 
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| Dreadful Gloomy Land | This level holds the most infamous, if not, hardest Star of the whole game. (was nerfed in the latest update and in the F.R.E.E release) | 
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| Stardust Constellation | 
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Secret Courses[]
| Name | Stars | Requirement | Notes |
|---|---|---|---|
| Fearsome Elite Tower | 2 | 20 Stars | The first Key stage. Does not contain a boss fight. |
| Swamp of Old Divinity | 65 Stars | The second Key stage. Does not contain a boss fight. | |
| Animosity Mansions | 5 | 90 Stars | The Bowser stage. Eventually does contain a fight. In addition, one of the Stars can only be collected from Eclipse of the Devourer via a hidden secret warp. |
| Ky Ascension | This level is the direct successor to Spiritual Ascension from King Boo's Revenge 2. | ||
| Unknown Origins | 4 | Accessible via a warp coin in Stormy Oceanic Town's entrance room. | |
| Path of the Gods' Trial | 6 | Supposedly to be the Metal Cap stage. | |
| Consuming Void Trial | 105 Stars (v1.0 - v1.6) 60 Stars (v1.7+) |
Supposedly to be the Wing Cap stage. Accessible via Mystery Mansion. | |
| Sacred Power Trial | 5 | Supposedly to be the Vanish Cap stage. | |
| Eclipse of Fusion | 7 | The new Eclipse stage variation combining both Sun and Moon sides. The stage is hidden behind and above the door to the second overworld. | |
| Eclipse of the Devourer | 6 | The newest type of the Eclipse stages. The stage name is a reference to the Devourer of Gods, a boss from Terraria: Calamity Mod. |
Miscelleanous[]
| Name | Stars | Requirement | Notes |
|---|---|---|---|
| Overworld 1 | 1 | A secret Star can be found by talking to Toad hidden in the Mystery Mansion room. Futhermore, all Cap Switches are hidden behind the Starting point. | |
| Overworld 2 | 4 | Key 1 | Four secret Stars can be found by finding two MIPS disguised as a crazy box, a hidden Star box in the lake and collecting 5 yellow secret coins scattered in the area. |
| Overworld 3 | 2 | Key 2 | Two secret Stars can be found by talking to two hidden Toads (one hidden in the Path of the Gods' room, another inside the tree near Animosity Mansions' entrance). |
Music[]
| Used in | Track | Source |
|---|---|---|
| Demo Screen | Passing Into the Night | Castlevania: Order of Ecclesia |
| File Select | Moving Scene | Mega Man Star Force |
| Overworld 1 | Treeshroud Forest | Pokémon Mystery Dungeon: Explorers of Time/Darkness/ Sky |
| Overworld 2 | ||
| Overworld 3 | Dusk Forest | |
| Star Select | Oh It's You | A Hat in Time |
| Mystery Mansion | Icicle Forest | Pokémon Mystery Dungeon: Explorers of Sky |
| Stormy Oceanic Town | Storm Eagle | Mega Man X |
| Sand Fusion Cavern | Zoness | Star Fox 64 |
| New King Boo's Prison | Vegeta's Theme | Dragon Ball Z Butoden 2 |
| Flowery Flower Field | Accumula Town[1] | Pokémon Black/White |
| Crazy Stirring Cocktail | Butter Building | Kirby: Nightmare in Dream Land |
| Peaceful Jingle Jungle | Vermillion City | Pokémon HeartGold/SoulSilver |
| Invasion Forestial | A Prologue | Castlevania: Order of Ecclesia |
| Mirage Trees | Spark Man | Mega Man 3 |
| Station 616 | Spaceport Alpha | Diddy Kong Racing |
| Mistic Mist's Revenge | Vampire Killer | Castlevania: Harmony of Dissonance |
| Poisonous Hollows | Piranha Creeper Creek | Super Mario 3D World |
| Heatwave Canyon | Min Min's Theme | Flying Dragon |
| Dreadful Gloomy Land | Art Tower ~ The Sinking Old Sanctuary | Castlevania: Legacy of Darkness |
| Stardust Constellation | Rush Hour | A Hat in Time: Nyakuza Metro |
| Fearsome Elite Tower | Silent Prison | Castlevania: Portrait of Ruin |
| Fearsome Elite Tower (Key Room) | Static | --- |
| Swamp of Old Divinity | C-Type [Slowed] | Tetris (Game Boy) |
| Swamp of Old Divinity (Key Room) | Literal Silence | (No, Really, Actual Silence) |
| Animosity Mansions | Clockwork | Castlevania: Circle of the Moon |
| Animosity Mansions (Fight) | Ultimate Koopa | Super Mario 64 |
| Path of the Gods' Trial | It's Showtime! | Mario & Luigi: Bowser's Inside Story |
| Consuming Void Trial | Magic Charm Lesson | Magician's Quest: Mysterious Times |
| Sacred Power Trial | X-Hunter (Stages 1 & 2) | Mega Man X2 |
| Ky Ascension | Commander Yammark | Mega Man X6 |
| Eclipse of Fusion | Scourge of the Universe (Devourer of Gods' Theme) | Terraria: Calamity Mod |
| Eclipse of the Devourer | ||
| Unknown Origins | Awake | Castlevania: Circle of the Moon |
| Boss Battle | The Flying Barrel: Ignition | Rayman 2: The Great Escape |
| Metal Cap | Master Battle | Paper Mario |
| Power-Up | Grape Garden | Kirby's Return to Dream Land |
| Star Jingle | Meridian Dance (Abridged Version) | Secret of Mana |
| Unused Track | Amp Plains | Pokemon Mystery Dungeon: Explorers of Time/Darkness/Sky |
| Unused Track | Deep Star Cave | Pokemon Mystery Dungeon: Explorers of Sky |
| Unused Track | Frosty Forest | Pokemon Mystery Dungeon: Red/Blue Rescue Team |
- ↑ It took more willpower than it should have to not link the hour-long Furret Walk, where this song features in. Instead, I looked for a version with build-up, like in the game. Video's 49 minutes, yeah, but who the fuck cares, really.