Rusted Moss cover
Rusted Moss screenshot
Genre: Shooter, Platform, Adventure, Indie

Rusted Moss

Rusted Moss Multiplayer!

Rusted Moss full soundtrack now available!

Rusted Moss Winter Update is out!!

Get Started with Modding!


Image: Playing as a really tiny Fern is no longer an impossible dream

Harlem512’s Documentation on Modding Rusted Moss: https://harlem512.github.io/rm-docs/

Have you ever wanted to have a mini map while playing the game? Custom Maya and Ameli palettes to go along with your custom Fern? Be chased by a deadly worm for the entirety of the game? (Ok, maybe that last one is just me).

Well, thanks to the talented mod makers in our official discord you can do just that. To make things easy to get going, Harlem512 has made a loader that is very convenient to manage mods. You can basically install mods from within Rusted Moss itself!


Image: Yup, you can basically install mods in-game now

Check out this steam guide by Harlem512 and get started! It also contains information on how to get started modding Rusted Moss to make your dreams come true.

You can also check out this direct link to the github: https://github.com/Harlem512/rm-mod-manager

Harlem512 has also made a really cool interactive map of Rusted Moss that we were all absolutely stunned by so you should look at it too: https://harlem512.github.io/rm-map.html/

Feel free to join our official discord where the modding community is:
DISCORD LINK

Previous Mod Support Update

For more info on PLAYISM:

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Winter Update Delay - End of Feb

Rusted Moss - Winter Update Announcement!

Rusted Moss - Player Skill Showcase



Check out some of our best players showing off their skills in our latest content update we released earlier this year!

When we released the free DLC update, we also asked players on our discord to submit their clips so we could make a montage of it. We sent a postcard to each player whose clips were chosen.

Thanks all who submitted! It is incredible seeing players make platforming look easy.

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Halloween Update - Ameli is here!




Happy Halloween everybody! Please welcome the great witch Ameli as our third playable character to Rusted Moss!

Also here are some bug fixes we also addressed in this update:

  • Bonus DLC: Enemies stuck in top ceilings fixed
  • Bonus DLC (hard mode): Red velvet corridor room transitions fixed
  • Maya dash through walls in the Robin fight fixed
  • Level redesign in Mountainside so players no longer have to fight Freia to proceed if they do not have grenades (easier to backtrack)


Why this update
For Valentine's Day this year, we released a multiplayer version of Rusted Moss that included Ameli and Maya as fighters.

We thought it would be fun to import Ameli's code into the main game.

Warning!
Unlike Maya, Ameli was not made with the main game in mind. Her abilities were designed specifically for PvP in Rusted Moss Arena.

This is more of a fun silly update though we did end up changing some of her abilities in an attempt to better fit the main game.

How to access Ameli
In the main menu, input this code: up up down down left right left right


How to play Ameli
Ameli has three pets that follow her instead of guns. She commands her pets to attack. In order to attack again, she'll have to recall the pet (by grappling it or pressing Q which costs mana) or wait for it to come back. She has six different attacks and special attacks (By default, Q and E activate her special attacks). Ameli can also fly on her broomstick. To do so, press Down while she is in the air.

Behind the Scenes
I think Ameli has the largest wardrobe when compared to any other character in Rusted Moss. She has a unique outfit in Rusted Moss Arena. In the main game, she also wears different clothes when she is flying on her broom versus when she is on the ground. Her boss design also took a very long time to do and we went through several iterations. Despite that, I wouldn't say she is our favourite boss and I think a boss taking more time to design also doesn't guarantee it will be a better fight anyway.

Her troublesome development history makes It fitting that Emlise went through several outfit iterations when deciding what she should wear when included as a playable character. Because Ameli was designed for Rusted Moss Arena, her readability became an issue when she was placed in Rusted Moss and she blended into the background. Emlise was also not very happy with her stiff animations.

Ameli also had to be resized as Rusted Moss is designed around a player height of around 2 blocks.

Please take a look at all the variations Emlise ended up making! (Our development group chat felt a bit like a fashion show where Emlise would post Ameli in yet another outfit)










The initial concepts were felt to be too similar to Freia's colour scheme. We also felt the bright colours and light flowing skirt did not mesh well with Ameli's personality. However, the skirt did help circumvent some animation problems we were having.

Emlise tried other skirt variations and we ended up liking the direction of stiff longer skirts. They felt more like clothes Ameli would wear.

In the end, the spirit of Halloween (and Ameli's love of witches) compelled us to put her in a witch costume. The giant hat also helped distinguish her silhouette more from the other characters.

If you enjoy looking at behind the scenes images and dev stories, you can also check out the Rusted Moss artbook!



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New Update: Redesigned boss fight (SPOILERS!!)

This patch contains a completely reworked boss fight. Details in the spoiler section.

Bug fixes: Removed slopes from some rooms in bonus content as they were causing collision problems for enemies.


  • Reworked boss: Robin, the Beloved Child (aka Puck)
  • Ending D speedrun mode achievement has 2 minutes added to the timer to accommodate the updated fight
  • Previous Robin fight is available in the boss rush room
  • New Robin fight has empowered mode in the boss rush room


The final boss of Ending D was something we felt we weren't 100% happy with. Due to the way Rusted Moss is coded, there were a lot of limits on what we could do. While the boss fight did end up being unique, we also had the impression it was a bit out of place due to it asking the players to use new movement/skills that previous parts of the game didn't really require. We also wanted a more organic and flowing use of the grappling hook but the fight itself is on the claustrophobic side due to the size of the room and copious bullets.

With the major update out of the way and Rusted Moss development basically being slowed all the way down to just bug fixes, we decided we had the bandwidth to try rework the fight a little and take another look at it.

There were still limits as to what we could achieve... The idea of having an infinite grapple and going through a crazy chase sequence was one of the concepts we were not able to do.

We were also wondering whether to post this patch earlier in August but seeing that Rusted Moss ended up being one of the games run for RTA in Japan made us hold back on it. Sure, the speedrunner was probably using a stable version of the game but it would have been kinda funny to see them reach the Ending D boss and it ended up being a completely different fight to what they practised.


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1.61 Hotfix Patch Notes

August 22, 2024 - Hotfix Patch Notes


Build ID: 15454256

Thank you all for playing Rusted Moss!
We have rolled out a hotfix which fixes an error that caused the game to crash if any mods were enabled.

Bug fixes



  • Fixed an error within mod-manager code that caused the game to crash if any mods were enabled..


We will continue to keep a close eye on your reports and feedback. If you would like to report a bug/issue, please use our pinned Bug Threads in the Discussions.

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