Super Mario Bros. X Forums

This is my pack of bosses from official games to fan-made games. Enjoy!

Screenshot: *The gifs may not be final as some may be from different versions. Assets from the gif may differentiate between versions.



Download Versions: Video: Changelogs: General Credits:
Most of the sprites were from Spriters Resource and their respective games. Most of the scripting were done by me. I thank of those from the discord server, though I couldn't remember but can recall on Enjil and Marioman2007. Some bosses may act based on various games. Some bosses may also act different than before as they're revamped. Some bosses have graphics and scripts originated from their respective users. Some fan-game bosses, both their behaviors and their sprites, are from their respective users from SMWC and others. Some bosses have assets from other several packs like from MegaDood, Mariolover64, MurphMario, KateBulka, and others.

Other Notes:
Some bosses might have a in-editor configurations, and some bosses might have no tilesets. To find the bosses, go to the browser of available item with a search in the editor and look for custom elements.

Special Thanks:

Version 1.0.1 has been updated, announcing 6 additional bosses including the boss that was used for the contest and some file fixes.

These bosses are so cool! I love the variety in them. Will definitely make levels a lot cooler

I'm awfully late to the Party, but those Bosses are awesome. My Favorites have to be Cerberus and Pyro Blaster, so it's also nice to see the SMWC Koopa Boss in SMBX. Are you planning on doing more SMWC Bosses in SMBX2 if I may ask?

Thank you, yeah I am going to plan some like SMWC Mario Kirby, Thunder Lakitu, and other ones even exclusive to other SMW Roms!

DRACalgar Law wrote: ↑

Wed Mar 08, 2023 9:33 pm

Thank you, yeah I am going to plan some like SMWC Mario Kirby, Thunder Lakitu, and other ones even exclusive to other SMW Roms!

Awesome. Are you also planning on maybe tackling Brutal Mario Bosses? I want to have the Twin Pumpkin Boss from the Gravity Fortress in my Episode, but I'm not too experienced in coding and kinda stuck with it at the moment.

DrMekar wrote: ↑

Thu Mar 09, 2023 3:47 am

DRACalgar Law wrote: ↑

Wed Mar 08, 2023 9:33 pm

Thank you, yeah I am going to plan some like SMWC Mario Kirby, Thunder Lakitu, and other ones even exclusive to other SMW Roms!

Awesome. Are you also planning on maybe tackling Brutal Mario Bosses? I want to have the Twin Pumpkin Boss from the Gravity Fortress in my Episode, but I'm not too experienced in coding and kinda stuck with it at the moment.

Well, most of them have some complex coding. So, some will except the Twin Pumpkin boss sadly.

DRACalgar Law wrote: ↑

Thu Mar 09, 2023 7:41 am

DrMekar wrote: ↑

Thu Mar 09, 2023 3:47 am

DRACalgar Law wrote: ↑

Wed Mar 08, 2023 9:33 pm

Thank you, yeah I am going to plan some like SMWC Mario Kirby, Thunder Lakitu, and other ones even exclusive to other SMW Roms!

Awesome. Are you also planning on maybe tackling Brutal Mario Bosses? I want to have the Twin Pumpkin Boss from the Gravity Fortress in my Episode, but I'm not too experienced in coding and kinda stuck with it at the moment.

Well, most of them have some complex coding. So, some will except the Twin Pumpkin boss sadly.

I see, maybe I gotta opt for another solution then. Fortunatly the Level isen't themed around them, so it's not a tragedy.

Can you make a Xan Bie boss please?

Mal8rk wrote: ↑

Thu Mar 09, 2023 9:47 am

Can you make a Xan Bie boss please?

Sure! I'll be glad to do so!

Shouldn't the Giant Koopa be named "Michael Jackson Koopa"? Because he sure loves doing the moonwalk...



It seems he likes to walk facing backwards and occasionally disappears.

Version 1.0.2. has been released for patch notes regarding Giant Koopa's frame error and more lively implementations to contents!

Added in 1 minute 53 seconds:

DisasterMaster wrote: ↑

Fri Mar 10, 2023 12:45 am

Shouldn't the Giant Koopa be named "Michael Jackson Koopa"? Because he sure loves doing the moonwalk...



It seems he likes to walk facing backwards and occasionally disappears.

It's been fixed, thanks for letting me know! It's now in V.1.0.2.

As someone who loves bosses but isn't very good at creating them, this pack is a blessing, great job!

Here's a tough to replicate boss: Ridley (Super Metroid). Wonder if you could make him?

TheGameyFireBro105 wrote: ↑

Mon Mar 13, 2023 5:19 pm

Here's a tough to replicate boss: Ridley (Super Metroid). Wonder if you could make him?

Probably not, it might be hard to replicate his tail physics and also hard to replicate his tail pogo attack.

Version 1.1.0 has been updated with 4 more addition bosses, Dread Bones, Roy (NSMBU), Bowser (MKF), and Ground Pound Koopa Boss, and with some patches of quality of life.

Nice, more Bosses. Sadly I entcountered Errors on two of them. (haven't tested Dread Bones as I already fought him in Boss Collection.)


Got this when wanting to try out Roy.


Same with the Ground Pound Koopa Boss

The Bowser Boss works and really awesome though.

DrMekar wrote: ↑

Mon Mar 20, 2023 3:50 pm

Nice, more Bosses. Sadly I entcountered Errors on two of them. (haven't tested Dread Bones as I already fought him in Boss Collection.)


Got this when wanting to try out Roy.


Same with the Ground Pound Koopa Boss

The Bowser Boss works and really awesome though.

Thank you, also I was trying to implement the work that whenever they get crushed by walls, they'd die. Looked something like this:
`if v:mem(0x134, FIELD_WORD) => 5 then
v:kill()
end`

MegaDood is the one who I have him test some of my bosses and give me some feedbacks that I should make them properly work or be balanced.

Added in 52 minutes 47 seconds:

Fixed as in Version 1.1.1, also added Ground Pound Koopa Boss' aggrolimit in case someone even decide to modify it for themselves.

I'm afraid I found another issue, I'd like to bring to your attention. Something invisble keeps killing me when fighting Roy, hope this GIF helps.


And about Groundpound Koopa


I really like this Pack as we've been starving for Bosses ever since with a few exceptions. While I'm able to make my own Bosses, theres still lots of things I cannot do for which this Pack is perfect.

Hello, it's been a couple months since my latest update.

The Version 2.0.0 has been majorly updated with new contents and some fixes. I made around 20 bosses with a quite variety. We got SMWC bosses and some epic bosses too.