Mods / Custom Boss

• DDynamo Manby 76561198802515796Based on the boss from Mega Man & Bass.69 downloadsupdated 7 y ago
• AA Tear In Realityby DoubleATam46 downloadsupdated 7 y ago
• TThe End of Aisnoda...?by mds2005Oh no! The Cybers seem to have something new up their evil, probably metal sleeves! An attempt to make a brand new weapon with power rivaling that of Gods!? But wait... Is it... is it actually doing anything? Did they even test this thing before sending it out? It seems like their apparent new Co...45 downloadsupdated 6 y ago
• ((5 Levels) Corporation of Close Combatby Whim WidgetKick, spin, reflect and punch! Battle your way through explosive foes to reach the top, using only close combat moves. Bunnies only appear for the most elite of foes!44 downloadsupdated 7 y ago
• ((4 Levels) Runiciaby Whim WidgetShort level pack, with a consistent enemy theme. Only for Boki, and only one difficulty.39 downloadsupdated 7 y ago
• CConstruct Treasuryby Whim WidgetWhat kind of cool stuff can you find in a construct's hoard? Wondering, "since when do constructs hoard?" just makes one even more curious on what's stashed away. - I wanted to mess around with "Blackberry" and the sound modifiers. I then saw Deizeb as a boss. Then this stage sort of happened. Th...38 downloadsupdated 4 y ago
• Aa bad ideaby Geli37 downloadsupdated 6 y ago
• CConstellation Chaosby WavetamerBattle the Star Serpent, an incredibly powerful Moon Virs with more than a few tricks up its sleeve!34 downloadsupdated 7 y ago
• ((4 Levels) Oil and Timeby Whim WidgetAn assortment of stages themed around oil mechanics. Watch out for anything that can trigger explosions! I've had these for a while, so I decided to add a boss and upload them.34 downloadsupdated 4 y ago
• KKonthet Lensby DoubleATam33 downloadsupdated 7 y ago
• AAtop the Stormy Towerby DoubleATam33 downloadsupdated 7 y ago
• SStay Focusedby DoubleATam31 downloadsupdated 7 y ago
• TThe Best Offenseby WavetamerOne of the first boss levels I ever made. I spruced up the fight for the new update so here you go.30 downloadsupdated 7 y ago
• SSelf-Destruct Sequence Initiatedby DoubleATam29 downloadsupdated 7 y ago
• LLiquid Coolby 404bennotfoundFrigid Yolomo Boss Use the ice blocks to your advantage! Watch out for snowballs, especially the laser ones.29 downloadsupdated 7 y ago
• OOrthogonalby Whim WidgetCan't shoot the boss, so how can you hurt it? The fighting happens at your own pace. There must be an easy way to take out all that health in the 3rd phase...29 downloadsupdated 7 y ago
• DDog Forceby Whim WidgetThremnats unite into Dog! A Dog that can use the powers of different Thremnat professions. Hard mode has a different dog. Different dog means different move-set...apparently. It's because the owners are different. The different owners are different professions.28 downloadsupdated 4 y ago
• TThe Panopticonby 404bennotfound28 downloadsupdated 7 y ago
• OOverclocked Batteryby 7656119841279528527 downloadsupdated 5 y ago
• BB U Nby D YellowMadness27 downloadsupdated 5 y ago
• UUnstable Rift Lab: Waste Pipesby 7656119841279528527 downloadsupdated 6 y ago
• EExemplary Exploderby DoubleATam27 downloadsupdated 7 y ago
• SSnomotraby MezzopianoMy first custom boss is an ice-themed one, because of course it is. Can you weather the chill of the dread Snomotra?27 downloadsupdated 7 y ago
• Aa sky boss dangerousby mds2005I was like "hey there, me. i wanna make a boss but i don't feel like designing the scenery and stuff, so why take one of the custom levels i already made and but a boss in it?" and then I made this thing. dark evil things are trying to take over the sky place dangerous. oh no! stop them so the sk...26 downloadsupdated 6 y ago
• HHeracles Beetleby DoubleATam26 downloadsupdated 7 y ago
• OOminous Eyeby DoubleATam26 downloadsupdated 7 y ago
• UUnexploded Ordnance?by DoubleATam24 downloadsupdated 7 y ago
• TThe Baaapocalypseby IryanDo you like sheep? Do you like Explosions? Do you like challenging bosses? If so, this level is for you! :D24 downloadsupdated 7 y ago
• TThe Happiest Rocketby Whim WidgetKeep your distance! If you know where they're going to be, maybe you can launch a trap.24 downloadsupdated 7 y ago
• BBumpy and Furtive Sortby Whim WidgetThere are just some times where you're chased into a closed room by a powerful and destructive bunny. In some of those moments, said powerful and destructive bunny can still attack through the room, even when it can't ever reach you. This fight is entirely one of those moments. How can you fight...24 downloadsupdated 7 y ago
• ((12 Levels) Desert Castleby 76561198994489554Embark on a journey filled with fire and swords! Some levels are REALLY hard, so good luck! Also, there are no soft locks whatsoever, just a heads up! Finally, have fun! :)23 downloadsupdated 2 y ago
• ((12 Levels) Frozen Volcanoby 76561198994489554Embark on a freezing AND fiery journey, with a VERY different hard mode! Black Hole out NOW! So good luck on that! Finally, have fun! :)23 downloadsupdated 2 y ago
• CCombustion Chamberby DoubleATam23 downloadsupdated 7 y ago
• SSanctuaryby 76561198327467114My first attempt at making a level pack. I hope I tried hard enough.22 downloadsupdated 3 y ago
• TThe Pharoah's Curseby 7656119832746711422 downloadsupdated 3 y ago
• CChemical Equationby 76561198327467114Beware! The Chemical's have molded the environment into an unstable form!19 downloadsupdated 3 y ago
• WWrath Of The Penguin Lord!!!by MidnightLunarCatThe Mighty Penguin Lord, Bringer of Doom, Annihilator of Hope, Eradicator of Dreams, Devourer of Sandwiches, The Scourge of Winter, The Forbidden And Also Forsaken One, sealed away for millennia, has begun to awaken!!! It has consumed the essence of all of the fallen Makyroonis (makyroonii?) (pen...17 downloadsupdated 10 mo ago
• TThe Summerby 7656119832746711415 downloadsupdated 2 y ago
• TThe Lookersby 76561198327467114Looking back on this old level, normal mode is a bit easy, and hard mode is still a walking (or rather, floating) nightmare. I wonder if I should redo it and include savant the next time.14 downloadsupdated 2 y ago
• TThe Winterby 7656119832746711414 downloadsupdated 2 y ago
• AA Very Explosive Bombby 7656119832746711412 downloadsupdated 21 mo ago

41 custom boss mods, most downloaded first. Each one has its own page here with what it needs to run and where its author publishes it; the files themselves stay with the author and are never re-hosted on this site.