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Welcome to SMW Central!

SMW Central is the largest ROM hacking community on the internet, and the gathering place for all the resources you need to create your own ROM hack. We offer a large selection of completed hacks as well, ready for you to play! Traditionally SMW Central focuses on hacking Super Mario World, but over the years we've collected a ton of resources and hacks involving other games, too. Our community is ever-growing — sign up now and be part of it!

Recent News

Mad Scientist ASM 2022 Has Begun!



And just like that, ASM is back on the contest menu! #smw{:TUP:} Go see what the mix-up is in the contest thread here.

Remember, you've got until September 19th, 6:00 PM GMT to submit your entries!

EDIT: Please re-read the rules thread as there has been significant changes/clarifications added. The deadline is now September 26th, 9:00 PM GMT. Use this extra time wisely!

KLDC 2022 - Entries and Clear Videos now LIVE



It's time to announce the 2022 Kaizo Level Design Contest results entrants!

This year, thanks to the efforts of our screeners and your clear videos, we have put together a resource page for everyone looking to download all of the contest entries in one click. We also have links to clear videos, judging streams, information from the screeners and more!

Visit the KLDC 2022 Page here!


This year's KLDC is dedicated to the memory of Howard "UghRochester" Hall, and to the joy and happiness he brought us through his friendship, positivity, and love of kaizo SMW.

R.I.P. UghRochester

The SMWCentral staff is heartbroken to join in mourning the sudden loss of Howard Hall, known in the Kaizo community as UghRochester.

As a long-time Twitch streamer of SMW hacks, UghRochester brought a spark of positivity and levity to his playthroughs, and maintained an inclusive and welcoming space for community members to learn about and enjoy watching both new and classic Kaizo SMW hacks. Many people new to streaming Kaizo hacks would find their first follower or subscriber to be Rochester, as he was always among the most willing to go out of his way to support and help new members of the community learn and grow their channels.

Rochester was a beacon of kindness and friendship to many, both online and offline. He could be counted on to be where Kaizo would be played, and his presence always made those events better. Whether he was there as a runner, commentator or just to support his friends and his community, UghRochester’s smile, hospitality and inclusivity became mainstays of Games Done Quick marathons where Super Mario World had a presence, and will be impossible to truly replace.

Our sincere condolences go out to the Hall family and to all who are mourning Howard.

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Latest Content

Road to New Haven

Screenshot Hey There! Thank you so much for checking out my first ever SMW Hack. This is a prelude to my expert hack that is on its way titled "NEW HAVEN". While I've had many test out NEW HAVEN, I… (read more…)

Swooper Eerie

Screenshot This is an Eerie which will cling to the ceiling and swoop down when Mario gets close, similarly to Swoopers. Afterwards, it will move in a straight line or in a wave motion like normal Eeries,… (read more…)

Koopa Eyes Offscreen Fix

Screenshot This patch fixes the bug where the eyes inside a Koopa Shell will appear on the wrong side of the screen when the Shell is offscreen to the right.

Trigger Cutscene on Level End

Screenshot This code allows you to have a vanilla cutscene (including credits) after getting a goal post/orb level clear, rather than having to use a boss. You can choose which cutscene in the asm file. Note… (read more…)

Terranigma - Fanfare

Victory theme from Terranigma.
You can disable the goal whistle by setting SMW_WHISTLE to 0 in the txt file (also reduces the insert size to 0x194).

32x32 Throw Block

Screenshot A 32x32 throw block that spawns a 32x32 throw block sprite when grabbed. See the readme for more details.

Trinkets v1.0

Screenshot Trinkets is a workspace and a series of batch scripts to help shorten and organize the process of SMW hacking by stuffing all commonly used hacking tools into a lunar magic toolbar. Other features… (read more…)