Homebrew Undertale on the Wii U and 3DS

[casrielasriel]

Hey all! My name is Casriel, and i am the Co Owner of Project Sunshine (originally Project Echo.) I work alongside the project owner Dorian and our other devs (owen_programmer, ralcactus, shortpie, cooingmaxito, etc) to develop a Undertale port to the 3DS and Wii U.

This UNDERTALE port is different than the one being developed by CooingMaxito (which is a demake.) Our port is a true GM port using a custom version of Butterscotch (GML 1.4 to C) called Cinnamon. Cinnamon allows the data .win to run on the 3DS and Wii U.

The port runs at a stable 30fps in most areas on Wii U, old 3ds, and new 3ds. A SURVEY_PROGRAM (DELTARUNE CH1) port using a new GMS 2 version of Cinnamon will soon be in the works.

The 3DS port also supports bottom screen and will be used for dialogue, fights, and menus. You can join the Discord server below and get access to current builds, aswell as sneak peeks at the project: https://discord.gg/UFf4Zm3eX

Hope to see you all there!!
psst.. asriel footage was taken on wii u

UPDATE!!!!!!!!!!!!!! 4/25/26
We have officially released the WIi U port!

The UNDERTALE port uses Cinnamon, our GML runner in C for the Wii U and 3DS! Cinnamon is a fork of Butterscotch.

I am excited to announce that the port has been released and the whole game is playable on all 3 routes!! This is a major achievement for us, the UNDERTALE community, and overall the Homebrew community in general, and I hope everyone who may like UNDERTALE and the Wii U enjoys this as this may mark a major turning point for GM games on the Wii U!

You can download the ports and get future builds that fix bugs (or new GM games that are ported) on our discord: https://discord.gg/AahyBCvVR2

The SRC is also public, so you can also help us fix and contribute: https://github.com/Project-Sunshine-Native/cinnamon

 

[siahisaforker]

thats alot of stubbed functions

 

[Moon164]

Is this the complete game from beginning to end? If so, I'll definitely get it to play with my girlfriend on the Wii U on my old CRT TV.

 

[MikaDubbz]

Is this like the 3rd version of Undertale being ported to Wii U? No judgement, I want to see at least one complete one get finished, but damn if that's not a lot of redundancy.

 

[siahisaforker]

Is this like the 3rd version of Undertale being ported to Wii U? No judgement, I want to see at least one complete one get finished, but damn if that's not a lot of redundancy.

pretty sure some of them were remakes, one of them got merged into another. I don't really know...

 

[casrielasriel]

you may like my next post.. (its out, whole game)

Is this like the 3rd version of Undertale being ported to Wii U? No judgement, I want to see at least one complete one get finished, but damn if that's not a lot of redundancy.

Post automatically merged: Apr 25, 2026

UPDATE!!!!!!!!!!!!!! 4/25/26
We have officially released the WIi U port!

The UNDERTALE port uses Cinnamon, our GML runner in C for the Wii U and 3DS! Cinnamon is a fork of Butterscotch.

I am excited to announce that the port has been released and the whole game is playable on all 3 routes!! This is a major achievement for us, the UNDERTALE community, and overall the Homebrew community in general, and I hope everyone who may like UNDERTALE and the Wii U enjoys this as this may mark a major turning point for GM games on the Wii U!

You can download the ports and get future builds that fix bugs (or new GM games that are ported) on our discord: https://discord.gg/AahyBCvVR2

The SRC is also public, so you can also help us fix and contribute: https://github.com/Project-Sunshine-Native/cinnamon

 

[siahisaforker]

you may like my next post.. (its out, whole game)

Post automatically merged: Apr 25, 2026

UPDATE!!!!!!!!!!!!!! 4/25/26
We have officially released the WIi U port!

The UNDERTALE port uses Cinnamon, our GML runner in C for the Wii U and 3DS! Cinnamon is a fork of Butterscotch.

I am excited to announce that the port has been released and the whole game is playable on all 3 routes!! This is a major achievement for us, the UNDERTALE community, and overall the Homebrew community in general, and I hope everyone who may like UNDERTALE and the Wii U enjoys this as this may mark a major turning point for GM games on the Wii U!

You can download the ports and get future builds that fix bugs (or new GM games that are ported) on our discord: https://discord.gg/AahyBCvVR2

The SRC is also public, so you can also help us fix and contribute: https://github.com/Project-Sunshine-Native/cinnamon


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looks like its high time for a sonic time twisted port, then

 

[N7Kopper]

Ooh, does this have mod support? There's a few things about the vanilla game I'm not overly fond of.

 

[siahisaforker]

Ooh, does this have mod support? There's a few things about the vanilla game I'm not overly fond of.

read into it a bit more. yes

 

[Dakangel]

We have officially released the WIi U port!

The UNDERTALE port uses Cinnamon, our GML runner in C for the Wii U and 3DS! Cinnamon is a fork of Butterscotch.

You can download the ports and get future builds that fix bugs (or new GM games that are ported) on our discord: https://discord.gg/AahyBCvVR2

The SRC is also public, so you can also help us fix and contribute: https://github.com/Project-Sunshine-Native/cinnamon

Congratulations on your achievement! One more game to the list for the Wii U!!
Hey, just to ask you if it´s possible to use Cinnamon for porting games like AM2R too?

 

[ILoveWiiU]

Great work, but could you possibly release the mod somewhere else? Like a Google Drive link or something? I think it's a great port and I love it (Actually, Toby himself originally wanted to port to 3DS and Wii U, (Wii U more so), but GameMaker, at the time, did not have support for 3DS/Wii U), it's just not everyone uses Discord. Thank you.

 

[justinbug2]

Yeah respost somewhere else, i been in the project sunshine server before and it was probably one of the worst discords i ever been in

Post automatically merged: Apr 27, 2026

How to install

1. Create a folder called “cinnamon” in SDMC:\wiiu\apps,
2. Move the “undertale.wuhb” attached in the zip to SDMC:\wiiu\apps\cinnamon,
3. Paste all contents in your UNDERTALE folder (typically located in Steam\steamapps\common\UNDERTALE, move your music and data.win!) directly into your Cinnamon folder.,
4. The title should now appear as UNDERTALE.

heres a zip with the wuhb, no pisscord needed

 

[Moon164]

you may like my next post.. (its out, whole game)

Post automatically merged: Apr 25, 2026

UPDATE!!!!!!!!!!!!!! 4/25/26
We have officially released the WIi U port!

The UNDERTALE port uses Cinnamon, our GML runner in C for the Wii U and 3DS! Cinnamon is a fork of Butterscotch.

I am excited to announce that the port has been released and the whole game is playable on all 3 routes!! This is a major achievement for us, the UNDERTALE community, and overall the Homebrew community in general, and I hope everyone who may like UNDERTALE and the Wii U enjoys this as this may mark a major turning point for GM games on the Wii U!

You can download the ports and get future builds that fix bugs (or new GM games that are ported) on our discord: https://discord.gg/AahyBCvVR2

The SRC is also public, so you can also help us fix and contribute: https://github.com/Project-Sunshine-Native/cinnamon


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That's so cool!!

I'll definitely play it with my girlfriend.

Do the PC version mods/patches work here? I want to apply the Brazilian Portuguese translation.

 

[siahisaforker]

That's so cool!!

I'll definitely play it with my girlfriend.

Do the PC version mods/patches work here? I want to apply the Brazilian Portuguese translation.

yes

 

[Technician]

yes

Is it possible to use the analog stick for movement or is it just the d-pad?

 

[SDA]

you may like my next post.. (its out, whole game)

Post automatically merged: Apr 25, 2026

UPDATE!!!!!!!!!!!!!! 4/25/26
We have officially released the WIi U port!

The UNDERTALE port uses Cinnamon, our GML runner in C for the Wii U and 3DS! Cinnamon is a fork of Butterscotch.

I am excited to announce that the port has been released and the whole game is playable on all 3 routes!! This is a major achievement for us, the UNDERTALE community, and overall the Homebrew community in general, and I hope everyone who may like UNDERTALE and the Wii U enjoys this as this may mark a major turning point for GM games on the Wii U!

You can download the ports and get future builds that fix bugs (or new GM games that are ported) on our discord: https://discord.gg/AahyBCvVR2

The SRC is also public, so you can also help us fix and contribute: https://github.com/Project-Sunshine-Native/cinnamon


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YES!!! It finally happened! I couldn't be any happier right now!

 

[siahisaforker]

Is it possible to use the analog stick for movement or is it just the d-pad?

not sure. I've only read stuff about it, only knew about the mods because on the releases page it states that you can patch your data.win before running it

 

[D00MGUY]

Wow, that's great news! I have a patch to translate the game into Italian that works on the PC version. Do you guys think there's any way to implement it into this one?

 

[casrielasriel]

Yeah respost somewhere else, i been in the project sunshine server before and it was probably one of the worst discords i ever been in

Post automatically merged: Apr 27, 2026

How to install

1. Create a folder called “cinnamon” in SDMC:\wiiu\apps,
2. Move the “undertale.wuhb” attached in the zip to SDMC:\wiiu\apps\cinnamon,
3. Paste all contents in your UNDERTALE folder (typically located in Steam\steamapps\common\UNDERTALE, move your music and data.win!) directly into your Cinnamon folder.,
4. The title should now appear as UNDERTALE.

heres a zip with the wuhb, no pisscord needed

interesting, why do ya say that

 

[prince_h]

Congrats!!!
I just tested it and it works. Thanks so much