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This page has notes that modders may find useful.


Apps

Decompile

To decompile Brotato for modding, use GDRETools, which can be downloaded here.

Godot

You'll need to download Godot to edit the decompiled project. Jonus has an excellent video here that covers the basics of modding, and will show you how to customise weapons and characters, and change item appearances. You can also read the documentation for Godot here.

Steam Errors

The standard version of Godot will have lots of errors related to the Steam API when you try to run it via Godot, due to it lacking inbuilt support for Steam's SDK. Instead, you can use an alternate version of Godot that has been compiled to include Steam support, called GodotSteam. Get the version you need for Brotato here (Godot v3.5).

Make sure you read GodotSteam's docs on exporting, because there are some limitations and caveats (eg. you can't use the "Export with Debug" option, and you need to set up your export templates manually).

Balancing

When balancing new items, referring to the vanilla Items can be very helpful.

We also have a special Items Grid page that shows all items in a grid, with buttons to filter by stat. This can help you identify gaps in vanilla's item pool that your mod might be able to fill, or see how much vanilla's stat increases differ by tier.

Characters with Positive Stats

Some characters start with very high base stats, which have the potential to instantly make your modded items OP:

Character Stat Value
Ranger Range 50
Sick Life Steal 25
Speedy Speed 30
Ghost Dodge 30
Hunter Range 100
One Armed Attack Speed 200

Characters with Negative Stats

If you're creating an effect that converts one negative stat to a different positive one, keep in mind that many Characters start with huge decreases to certain stats.

The vanilla items that use this effect are: Esty's Couch.png Esty's Couch (-Speed), and Retromation's Hoodie.png Retromation's Hoodie (-Dodge).

Character Stats Value Notes
Brawler Range -50
Ranged Damage -50
Crazy Dodge -30%
Mage Ranged Damage -100 No longer the case since v0.8.0.0
Melee Damage -100 No longer the case since v0.8.0.0
Engineering -50 No longer the case since v0.8.0.0
Chunky Life Steal -100
Lucky Attack Speed -60%
Mutant Items Price -50%
Loud Harvesting -95% (-3 per wave)
Pacifist Damage -100%
Engineering -100
Saver Items Price -50%
Sick HP Regeneration -100
Ghost Armor -100
Speedy Armor while standing still -100
Doctor Attack Speed -100%
Artificer Damage -100%
Masochist Damage -100%

Item Costs

Item costs for each tier in vanilla are as follows:

Tier Min Max
Tier 1 8 30
Tier 2 35 65
Tier 3 50 100
Tier 4 80 130

Weapon Costs

Weapon costs for each tier in vanilla. There are 3 different "Max" columns, because weapons that only start from tiers 2/3 have considerably higher max prices than weapons that start from tier 1.

Tier Min Max Max T2 Max T3
Tier 1 10 20 -
Tier 2 22 39 56 -
Tier 3 45 74 103 144
Tier 4 91 149 207 289

Community Guide

Here's a guide written by a community member about balancing: Modding Balance Guide.

DebugService

You can use DebugService to edit your items, weapons, starting materials, and much more.

To access these options:

  • In the FileSystem tab, find singletons/debug_service.tscn and double-click it.
  • In the Scene tab, double-click DebugService.
  • The debug options will be shown in the Inspector tab.
Option Type Default Effect
Starting Wave int 1 Sets initial wave. Supports 1 - 999
Starting Gold int 30 Sets initial materials.
Invulnerable bool false Disables your hurtbox. Prevents things like Bull's effect from triggering.
Invisible bool false Player is invisible.
One Shot Enemies bool false All enemies die in 1 hit.
Instant Waves bool false Waves only last 1 second. Great for testing shops
No Fullscreen on Launch bool false Prevents the game from launching into fullscreen.
Debug Weapons array [] Weapons to add at the start of each wave. Can add multiple of the same weapon
Debug Items array [] Items to add once, at the start of the next wave. Can add multiple of the same item
Remove Starting Weapons bool false Removes your starting weapons.
Add All Weapons bool false Adds every weapon. Can go over your character's weapon limit
Add All Items bool false Adds every item to your character. Can be combined with debug_items to stack them
Unlock All Chars bool false Unlocks all characters. Temporary
Unlock All Challenges bool false Permanent. Unlocks all challenges:
  • Completes every challenge
  • Unlocks their Steam achievements
  • Saves this data to your save file

Make sure you enable the "Disable Saving" option before using this, otherwise it will affect your save file.

Unlock All Difficulties bool false Unlocks all danger levels. Temporary
Generate Full Unlocked Save File bool false
Reinitialize Save bool false
Reinitialize Steam Data bool false
Disabling Saving bool false Highly recommended.

Prevents the game from ever saving, which protects your save file. Always use if you also enable "Unlock All Challenges".

Randomize Equipment bool false
  • Start with 6 of a random weapon.
  • Start with 10 - 500 materials.
  • Start at level 10 - 26.
Hide Wave Timer bool false
Nullify Enemy Speed bool false
No Enemies bool false
Debug Enemies bool false
Spawn Specific Elite bool false Forces a specific Elite to spawn during an Elite wave. Does nothing on regular waves. Details below.

Spawn Specific Elite

To spawn a specific Elite, enter an elite string for spawn_specific_elite, as one of the following:

  • elite_butcher
  • elite_colossus
  • elite_croco
  • elite_demon
  • elite_insect
  • elite_mom
  • elite_monk
  • elite_rhino

These names come from the resource (.tres) files in res://entities/units/enemies/elites/

You need to start a new run after setting this variable, as elites/hordes etc. are determined at the start of a run.

Note that this does not force an Elite to spawn on any wave. It only changes the Elite that will spawn on an Elite wave.

Effects

See Modding Effects for a list of all the effects available in vanilla.

Text - BBCode

You can use some BBCode in your item descriptions. View the available options in the Godot docs.

Related Files

These files are related to text, and mostly apply colors:

  • singletons/text.gd
  • weapons/weapon_stats/weapon_stats.gd
    • In this file, col_pos_a means "color positive, part A", with part B being the closing [/color]
  • singletons/utils.gd
    • This file also sets the icon size (see Image Icons below)
  • ui/menus/shop/item_description.gd
    • Sets weapon and item descriptions. It's a good place to start if you're looking for the code that handles them.
  • items/global/effect.gd
    • Has the function get_text, which modifies stats used by effects

Color Options

For programming (ie. not BBCode), see also: Color class; color constants cheatsheet.

Code Color Example Notes Via
[color=#00ff00]TEXT[/color] Green TEXT Utils.POS_COLOR_STR
[color=red]TEXT[/color] Red TEXT Utils.NEG_COLOR_STR
[color=white]TEXT[/color] White TEXT Color.white
[color=#555555]TEXT[/color] Grey TEXT Utils.GRAY_COLOR_STR
[color=#76FF76]TEXT[/color] Materials TEXT Actually rgb(118,255,118) Utils.GOLD_COLOR
[color=#EAE2B0]TEXT[/color] Secondary TEXT Actually rgb(234,226,176) Utils.SECONDARY_FONT_COLOR
[color=#C8C8C8]TEXT[/color] Tier 1 TEXT NA [c 1]
[color=#4A9BD1]TEXT[/color] Tier 2 TEXT Actually rgb(74,155,209) ItemService.TIER_UNCOMMON_COLOR
[color=#AD5AFF]TEXT[/color] Tier 3 TEXT Actually rgb(173,90,255) ItemService.TIER_RARE_COLOR
[color=#FF3B3B]TEXT[/color] Tier 4 TEXT Actually rgb(255,59,59) ItemService.TIER_LEGENDARY_COLOR
  1. ↑ Tier 1 uses Color.white in-game. This grey color is only used on the wiki, to differentiate this tier

Image Icons

You can add an image with the code [img=20x20]res://path_to_image/file.png[/img].

  • The size 20x20 applies to the default font size (100%).
    • At the minimum font size of 80%, the image size is 16x16.
    • At the maximum of 125%, the image size is 25x25.
  • If you want to show scaled stat icons, you can use Utils.get_scaling_stat_text(stat_name) (see singletons/utils.gd).
    • The code in this func also shows how to get a scaled size for a custom image (var w = 20 * ProgressData.settings.font_size)

Here's the code for showing stat icons, when the Font Size option is set to its default 100%:

BBCode for stat icons
BBCode Icon Stat Name
[img=20x20]res://items/stats/max_hp.png[/img] Max HP.png Max HP
[img=20x20]res://items/stats/hp_regeneration.png[/img] HP Regeneration.png HP Regeneration
[img=20x20]res://items/stats/lifesteal.png[/img] Life Steal.png Life Steal
[img=20x20]res://items/stats/percent_damage.png[/img] Damage.png Damage
[img=20x20]res://items/stats/melee_damage.png[/img] Melee Damage.png Melee Damage
[img=20x20]res://items/stats/ranged_damage.png[/img] Ranged Damage.png Ranged Damage
[img=20x20]res://items/stats/elemental_damage.png[/img] Elemental Damage.png Elemental Damage
[img=20x20]res://items/stats/attack_speed.png[/img] Attack Speed.png Attack Speed
[img=20x20]res://items/stats/crit_chance.png[/img] Crit Chance.png Crit Chance
[img=20x20]res://items/stats/engineering.png[/img] Engineering Stat.png Engineering
[img=20x20]res://items/stats/range.png[/img] Range Stat.png Range
[img=20x20]res://items/stats/armor.png[/img] Armor.png Armor
[img=20x20]res://items/stats/dodge.png[/img] Dodge Stat.png Dodge
[img=20x20]res://items/stats/speed.png[/img] Speed Stat.png Speed
[img=20x20]res://items/stats/luck.png[/img] Luck.png Luck
[img=20x20]res://items/stats/harvesting.png[/img] Harvesting.png Harvesting

Misc

For line breaks, use "\n".

To hide an item description, set the effect key to [EMPTY].

Limitations

Bold ([b]) and italics ([i]) don't work, because the vanilla game doesn't have support for them.

Text - Stats

Dynamic Stats

Item descriptions in the shop are retrieved the first time it appears, so any dynamic stats will need to account for this. It might mean that the stats your item shows are different once the item is bought.

They're also retrieved every time you hover over an item (via get_args), which gives you more freedom to use dynamic stats than the shop descriptions.

get_args

Use get_args to pass variables to your item descriptions. They replace {0}, {1}, etc, with each item in the array that get_args returns acting as a replacement for the matching {index} string in your translation.

The default effect (effect.gd) only passes 1 arg, value (0), which is converted from an int to string with str(value).

Most custom effects (eg. stat_effect.gd) pass 2 args: value (0) and key (1), with key being translated using tr(key.to_upper()).

You can use key_text to apply a custom effect description.

As mentioned above, you can also hide an item's description by setting the key_text to [EMPTY].

Translations

Guide

To add translations:

  1. Create your CSV translation file
  2. Drag it into your project's file system

Here's how your CSV should look:

Guide-Translations 1.png

Godot will automatically generate .translation files for each of the languages you've specified.

You can view the vanilla translation file:

Translation Notes

See Godot's tutorial Internationalizing games for more info on using translations. You may also find the docs on TranslationServer helpful.

You can use tr() to access translated strings. It's a native function.

To use commas, wrap your string in quotes, eg: "Potatoes are good, potatoes are cool"

Item Tags

The following item tags are used in vanilla:

Stats Misc
stat_armor economy
stat_attack_speed exploration
stat_crit_chance explosive
stat_dodge less_enemies
stat_elemental_damage less_enemy_speed
stat_engineering more_enemies
stat_harvesting pickup
stat_hp_regeneration saving
stat_lifesteal stand_still
stat_luck xp_gain
stat_max_hp
stat_melee_damage
stat_percent_damage
stat_range
stat_ranged_damage
stat_speed

Multi Mod

If you're building a mod, creating it to work with dami's Multi Mod might be worth considering. It lets you add your mod pack to any compatible mod (eg. Invasion/dami's Arsenal). It lets you create custom characters, weapons, and items, and release your mod as a small standalone file (usually <3mb).

The only caveat is that you can't touch vanilla code, and can't currently add new weapon classes or challenges.

Weapon Cooldowns

Calculating the displayed cooldown text is tricky. The formula for Ranged weapons is easy to calculate, but the Melee formula is complex and takes many things into consideration. For this reason, Darkly77 made an cooldown text calculator, here:

Cooldown Calculator

Weapon Notes

Weapon stats have an option called increase_projectile_speed_with_range. In vanilla, this is only used by Flamethrower.png Flamethrower and Incendiary Turret.png Incendiary Turret, as their flame projectiles don't interact with Range in the usual way. So this option just makes their projectiles go further, because they're moving faster. Search for this var in weapon_service.gd to see the formula.

GitHub

There's a GitHub organisation for Brotato repos here. It is maintained by Darkly77, KANA, and dami, who are all active on the Space Potatoes Discord.

It's not recommended to host a full Brotato project on GitHub, because you'd be making all of Brotato's source code public. But you can host just your modded files (eg Darkly77's Invasion), or even just host the downloads for your mod (eg. KANA's mod releases)

Hosting your downloads on GitHub has a few advantages:

  • You can create versioned README and CHANGELOG files to track your mod's changes.
  • You can create separate releases, which track the release date.
  • You can view download stats with this tool.
Modding [T]
Wiki Modding  •  Notes  •  Effects  •  Vanilla Items
Godot Download  •  Docs  •  GDRETools  •  GodotSteam  •  Jonus' Tutorial
Misc BrotatoMods  •  Cooldown Calculator
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