Custom Difficulty Mod (v1.6.1) for DELTARUNE (v1.04)

Custom Difficulty

• Fixed crash w/ first Lancer battle when sparing on high mercy settings.
• Fix for <20% cooldowns was only applying to chapter 3, now works for all chapters & demo.

Please check and report any bugs/issues >here<.

Custom Difficulty Mod (v1.6.0) for DELTARUNE (v1.04)

This update marks the full implementation of all planned features. Future patches will likely only be to address bugs or to support updates to the base game (such as new chapters).

Please check and report any bugs/issues >here<.

Custom Difficulty

• Categorised existing settings under "Battle" & "Down".
• Added new category "Player" with the following settings: Damage, Healing, TP Gain, Mercy.
• Enemy Cooldowns should now apply to Chapter 4. Although, many heavily scripted attacks/encounters won't change much if at all. (If anyone wants to try adding the setting to those encounters raise a PR on the GitHub page)
  • Winglade's aim attack is hard capped at >50% cooldown to prevent it from getting stuck.
• All known crashes related to Enemy Cooldowns have been fixed: cooldown < 20%, ch3 super-boss at low cooldowns, shutta+shadowman encounter. It's possible other crashes may occur that were obscured by the '< 20%' crash, please report these!
  • Chapter 3's super boss' full-screen attack is hard capped at >25% cooldown to prevent crashing.

Platform Support

• Updated mod-packs to support the latest standard for Deltamod/Deltahub (revision 1.4). The mod should hopefully now work again with these launchers.

Mod Menu

• Can now add headers to mod forms. These are defined by setting their title, without any other properties. Helpful for organising settings into categories.
• To avoid confusion after installing this mod tool; if no mod pages have been configured, the "MODS" button still appears and the text "No mod menus found" will be displayed.

Custom Difficulty Mod (v1.5.1) for DELTARUNE (v1.04)

Custom Difficulty

• Fixed crashes in the last few encounters of chapter 3.

Mod Menu is unchanged

Custom Difficulty Mod (v1.5.0) for DELTARUNE (v1.04)

Custom Difficulty

• Added difficulty presets: Easy, Normal, Hard, Nightmare, Nightmare-EX, Nightmare-Neo, No-Hit.
• Removed 'Experiment' tag from Enemy Cooldowns.
  • Various Enemy Cooldown fixes/tweaks detailed further below.
  • Added 'WIP' tag to chapter 4 as it is still in progress.
  • There are a couple of known crashes in chapter 3 that are pending investigation.
• Added option for something cooldowns related in chapter 3.
• Remove TP Gain from the menu to reduce clutter as its not that useful. You can still edit it in the ini file.
• Added framework and guide for mod devs to add compatibility.

Platform Support

• Added support for Deltahub (new unified standard).

Mod Menu (only relevant to mod-developers using this tool)

• Added top-level option left_value_pos_en. Adjusts the left side position of the values in the menu.
• Added rowdata option on_change. Allows a function to be called every step that a value is changed.
• Added rowdata option force_scroll. Force scroll behaviour for value ranges that are only labels (rather than toggle).
• Labels now accept bools and strings.
• Reduced max scroll speed to a sane value.

Enemy Cooldown Fixes

• Some attacks crash the game if the heart doesn't exist yet so it now flies out onto the box quicker (proportional to enemy cooldowns).
• Include Lancer's overworld attacks.
• Include K.Round leap attacks.
• Include Star Bird's overworld attacks.
• Include final chain (Spade King's box drag attack), the time to decide next path is affected by cooldown.
• Include hang plugs overworld attacks.
• Include Were(were)wire, Sweet Cap'n Cakes, Berdly, Spamton, Queen, Spamton Neo.
• Include Shadowmans' tommy guns, Lanino & Elnina, Water Cooler, Zapper, Tenna, A Certain Someone.
• Include special chapter 3 enemies.

Enemy Cooldown Tweaks

• Reduce random placement of heart shapers (Head Hathy) at lower cooldowns as the attack can trap you.
• Cap timer reduction for wave chain (Spade King) as it becomes a solid wall quite quickly.
• Shorten tails for chain of hell (Spade King's chain bullets) at lower cooldowns as the attack can trap you.
• Ensure Queen's leg stomp attack waits for an available slot before spawning a leg, instead of flooding the box.

Custom Difficulty Mod (v1.4.0) for DELTARUNE (v1.04)

Custom Difficulty

• Added option Experiment: Enemy CDs.
  • Multiplier for the cooldown between enemy attacks & bullet patterns.
  • Marked experimental, as this feature is new and untested. There might be encounters that are unaffected by the setting, or affected in a negative way. Feedback very welcome.
• When scrolling through values in the menu, acceleration is now applied. Selecting values should no longer feel too fiddly, or too slow.

Platform Support

• Updated Deltamod packs to provide unique package ids.
• Fixed windows installer improperly reporting that no chapter files are found (it was finding them fine).

ModMenu (only relevant to mod-developers using this tool)

• When scrolling through values in the menu, acceleration is now applied. Selecting values should no longer feel too fiddly, or too slow.
• Added left_margin_en option to top-level menu config. This is optional and defaults to 40. Reduces or increases the margin on the left side of the menu. Useful if you're having trouble fitting text in the box.
• Added new value range type MinMax to replace Percentage.
  • Similar definition to the Percentage range, but uses ~ as the separator. <min>~<max>%
  • Supports negative values. e.g. -100~100%
  • Supports integer (non-percentage) values. e.g. 0~10
  • Percentage range still exists for legacy support but is considered to be deprecated.
• Label value ranges can now have their values expressed as percentages. e.g. SMALL=50%;MEDIUM=100%;LARGE=200%
• Fix white-spacing issue for % values on the demo.

Custom Difficulty Mod (v1.3.2) for DELTARUNE (v1.04)

• Fixed Linux installer not detecting data.win files.

Custom Difficulty Mod (v1.3.1) for DELTARUNE (v1.04)

• Added installer for Linux w\ Proton.

Custom Difficulty Mod (v1.3.0) for DELTARUNE (v1.04)

• Added support for Deltamod mod manager.
  • NOTICE: At the time of writing (24/08/25) - this is not currently a viable installation method as Deltamod errors when combining the mod packs.
• Added support for the demo version of Deltarune (for installers and Deltamod).
• Fixed potential issue with ch4 boss not one-shotting on no-hit settings.

Custom Difficulty Mod (v1.2.0) for DELTARUNE (v1.04)

• New installers for Windows & MacOS thanks to @jamesondh.
  • Autodetects Deltarune's steam install folder - can be run from anywhere.
  • Downloads required UndertaleModTool - no longer bundled with the mod files.
  • See readme for more info.
• Compatibility fix for DeltaESP's Spanish translation mod.
• ModMenu refactor: can trigger functions from menu buttons (such as the 'reset to defaults' button).

Custom Difficulty Mod (v1.1.2) for DELTARUNE (v1.04)

• Hit.All: Fixed ch3 giga boss leaving Kris at 1 hp for certain attacks.