Map metadata is information that defines how some level-wide characteristics should be configured. This is primarily split up into two parts - the Metadata menu in Lönn/Ahorn, and the meta.yaml file for each map. The lönn and Ahorn windows are relatively self explanatory, and can be found under Map > Metadata. The meta.yaml file is more complex, and is where you define information like the endscreen a level uses, or what the overworld should look like.

ℹ️ Many of the simpler options are documented in Ahorn itself via tooltips, which you can view by hovering over the options name.

ℹ️ The metadata for the vanilla maps is not stored like this. You can find a compilation in .meta.yaml format on the Vanilla Metadata page.

To set up a meta.yaml file, either create a blank mapname.meta.yaml, or grab one from the example mod, and paste it into the same folder as your map's .bin file. Note the mapname part of the filename - this is how Everest knows what map it should apply the data to, and should be identical to the name for your .bin file.

ℹ️ Note that meta.yaml changes aren't hot reloaded, so if you want to check any changes you make, you'll need to restart Celeste.

First, you have to ensure your map follows the mod structure. In particular, your map bin should be in Mods/yourmodname/Maps/yournickname/campaignname/mapname.bin.

You should now create the file Mods/yourmodname/Dialog/English.txt and paste in the following:

yournickname_campaignname= Campaign Name
yournickname_campaignname_mapname= Map Name

It also works to define checkpoint names:

yournickname_campaignname_mapname_roomname= CheckpointName

As a general rule, if you see {blah_blah} in the game, and you want it to display some text instead, you need to add this in your English.txt:

blah_blah= some text

(If you feel like translating your map name in other languages, you can create other files in the Dialog directory, for example French.txt. All non-existing languages will fall back to English.)

To specify the text that appears when collecting a heart in your map, head back to your English.txt and add the following line below the ones denoting your map name.

poem_yournickname_campaigname_mapname_mapside= HeartText

Replace the nickname and campaign name as you did above, the mapname with your maps .bin name minus the extension, and the mapside with either A, B, or C, before entering the text you want to display to the right, and then saving and reloading your map.

Do also note that if you want your level to end upon collecting the heart you'll need to navigate to the Map > Metadata > Mode section in Ahorn and toggle End Level on Heart.

You can define the map icon in Ahorn, in the Title Banner Icon field of the Map > Metadata menu.

If you want to use a custom icon, place it in Mods/yourmodname/Graphics/Atlases/Gui/areas/yournickname/campaignname/mymapicon.png (and mymapicon_back.png for the icon's back), then use areas/yournickname/campaignname/mymapicon as the map's icon. The icon should be 180x180.

You can specify the colours of the banner and text that appear behind your icon can be changed by editing the Title Base Colour and Title Accent Colour - if you don't specify this, it will just default to Grey. If you just want to copy a vanilla banner, you can find them listed below.

Prologue/Epilogue: 383838, 50afae
Forsaken City: 6c7c81, 2f344b
Old Site: 247f35, e4ef69
Celestial Resort: b93c27, ffdd42
Golden Ridge: ff7f83, 6d54b7 
Mirror Temple: 8314bc, df72f9
Reflection: 359fe0, 3c5cbc
The Summit: ffd819, 197db7
Core: 761008, e0201d
Farewell: 240d7c, ff6aa9 

You can also customize the texture used for the banner and the accent (the differently colored shape to the left of the banner) by placing it in the appropriate folder as follows (requires the latest dev version of Everest):

If your map is in Mods/yourmod/Maps/foldername/mapname.bin:

• if you want a banner specific to your campaign, drop the textures in Mods/yourmod/Graphics/Atlases/Gui/areaselect/foldername/title.png and accent.png.
• if you want a banner specific to one of your maps, drop the textures in Mods/yourmod/Graphics/Atlases/Gui/areaselect/foldername/mapname_title.png and mapname_accent.png.

If you want the textures to be displayed as is, set the appropriate color to ffffff in Metadata.

You will find the vanilla banner in the graphics dump (check the Useful Links page), in Graphics/Atlases/Gui/areaselect.

The scarf that appears behind your map's icon can also be changed by placing the texture for it in a folder that matches your campaign/map's path.

If your map is in Mods/yourmod/Maps/foldername/mapname.bin:

• if you want a scarf specific to your campaign, drop it in Mods/yourmod/Graphics/Atlases/Gui/areas/foldername/hover.png
• if you want a scarf specific to one of your maps, drop it in Mods/yourmod/Graphics/Atlases/Gui/areas/foldername/mapname_hover.png

You will find the vanilla scarf in the graphics dump (check the Useful Links page), in Graphics/Atlases/Gui/areas/hover.png.

You can change the chapter card (the card that shows up when your chapter is selected, showing collected berries, deaths, etc):

If your map is in Mods/yourmod/Maps/foldername/mapname.bin:

• if you want a chapter card specific to your campaign, drop the textures in Mods/yourmod/Graphics/Atlases/Gui/areaselect/foldername/card.png, cardtop.png, card_golden.png and cardtop_golden.png.
• if you want a chapter card specific to one of your maps, drop the textures in Mods/yourmod/Graphics/Atlases/Gui/areaselect/foldername/mapname_card.png, mapname_cardtop.png, mapname_card_golden.png and mapname_cardtop_golden.png.

Here is an example setup for a map in Mods/CardTestMod/Maps/SSM24/cardtest/test2.bin, for both the campaign and the map itself:

You will find the vanilla chapter card in the graphics dump (check the Useful Links page), in Graphics/Atlases/Gui/areaselect.

First you need to mask your checkpoint images to look like vanilla ones: follow the instructions to do that here.

Then, if your map is in Mods/yourmodname/Maps/yournickname/campaignname/mapname.bin, you should drop your checkpoint images to this location for them to work:

Mods/yourmodname/Graphics/Atlases/Checkpoints/yournickname/campaignname/mapname/side/roomname.png

Replace side with A, B or C, and roomname with the name of the room the checkpoint is in, or start for the starting checkpoint.

To add the mask over the checkpoint images, visit Postcard 🔗. Simply upload your screenshot, hit submit, and save the new image. Please report issues to @leo60228#0480 on Discord. If this doesn't work, manual instructions are also available below.

For starters, download this mask. (using other masks from a graphics dump of Celeste is fine also)

Right click your original image in the layers tab and click Add Layer Mask.

Be sure you have Transfer Layer's Alpha Channel chosen and Invert Mask checkmarked, then, right click on the checkpoint mask in the editor and Copy it. (Edit > Copy)

In the layer tab be sure that the black part of the original image is selected (that's the mask), then right click in the editor and paste.

Use a tool like the Rectangle Select tool to get rid of the floating selection layer by clicking anywhere in the editor - you should now see your image with the checkpoint mask on it.

Interlude chapters are typically chapters that lack collectibles and significant gameplay, like Prologue and Epilogue in vanilla. By checking the Interlude box in Ahorn, the chapters name will be centered vertically and the Chapter x removed from the banner, collectibles and deaths will not appear on the chapter card, and the chapter will not show in the journal or as a datapoint on the file select cards. Toggling this setting also breaks B- and C-Sides for the chapter.

These are the short transition animations that play when the player is respawning after death. If you want to use your own custom wipes, you'll need a sequence of 1920x1080 black and white images, which can then be converted into a wipe at this site 🔗.

Bloom is a value that controls how much light static objects emit (like foreground tiles or decals, rather than torches). Increasing Bloom Base will make things give off light, while Bloom Strength will increase how much light those objects emit - you can think of it as a multiplier to Bloom Base. Note that increasing this value too far may impact photosensitive players, and it is recommended to include warnings and a way to alter the bloom if your default bloom is quite strong.

Alters how dark the map is, and ranges from 0.0 to 1.0, with 1.0 being the darkest. This helps you alter how dark your map is incrementally without simply enabling the "dark" option.

To create a colourgrade for yourself, you'll want to open up a copy of the none.png colourgrade from your Celeste installation, and either edit it manually or apply a colour filter to shift colours to appear closer to the colour of your filter (for example, if you wanted a colourgrade for an ice map, you might apply a blue filter). You should then export the image, give it an appropriate name (for our blue example, it might be yournicknameblue), and then place the exported image in yourmodname/Graphics/ColorGrading/yourname/campaignname. It should now appear as an option in the Colour Grade dropdown. You can also use this page 🔗 to generate your own colorgrades.

Colourgrades are essentially a map for the game of what colours should be shown as to the player. This is represented as a 16x16x16 cube, split up to be a 256x16 2d image - ie each square that you see represents one layer of the cube. So if you wanted to change any instances of #000000 that appear on your screen to say, #fc4ee2, you would edit the topleftmost pixel to that colour, and you can repeat this for any colour represented. If a value isn't represented by the 4096 pixels, it will simply be interpolated between the nearest 4 pixels on the 2d image.

Postcards will appear whenever you start a level, and display a short snippet of text.

To customize them, head back to your English.txt and paste in

yournickname_campaignname_mapname_postcard= YourTextHere

What the example text corresponds to and what to replace it with is documented above.

A loading vignette is displayed when a level is selected, similarly to the Intro, Summit, and Core chapters.

To display an image, use the same structure as a Chapter Complete Screen, but replace CompleteScreen with LoadingVignetteScreen.

To display text, add the following and replace Dialog_ID_Here with your maps Dialog ID:

LoadingVignetteText:
    Dialog: "Dialog_ID_Here"

Note that only one of these can be used for each level.

By default, the map metadata for the A-side is also used for the B and C-Sides. Some metadata can be overridden by checking OverrideASideMeta in the B/C side metadata.

A semi-comprehensive list of the features that can be overridden is as follows:

• IntroType
• Dreaming
• ColorGrade
• DarknessAlpha
• BloomBase
• BloomStrength
• CoreMode

If any of this information is incorrect, feel free to correct it and to shout at maddie480#4596 on Discord.