Difficulty Adjust (mod)

Difficulty Adjust

Override a beatmap's difficulty settings.

Acronym	DA
Type	Conversion
Game modes
Score multiplier	See Scoring
Status	Unranked
Incompatible mods	Easy (EZ), Hard Rock (HR), Target Practice (TP)
Incompatible mods	Easy (EZ), Hard Rock (HR)

Difficulty Adjust allows players to change the difficulty settings of a beatmap. Which settings can be changed depends on the selected game mode.

Customisation

osu!

• Circle Size (0–10, default: CS of selected beatmap): Change the circle size to a specific value.
• HP Drain (0–10, default: HP of selected beatmap): Change the HP drain rate to a specific value.
• Accuracy (0–10, default: OD of selected beatmap): Change the overall difficulty to a specific value.
• Approach Rate (0–10, default: AR of selected beatmap): Change the approach rate to a specific value.
• Extended Limits (default: disabled): Allows the user to increase Circle Size, HP Drain, Accuracy and Approach Rate up to 11. Additionally, the approach rate can be adjusted to negative values (down to -10).

osu!taiko

• HP Drain (0–10, default: HP of selected beatmap): Change the HP drain rate to a specific value.
• Accuracy (0–10, default: OD of selected beatmap): Change the overall difficulty to a specific value.
• Scroll Speed (0.25–4, default: SS of selected beatmap): Change the scroll speed to a specific value.
• Extended Limits (default: disabled): Allows the user to increase HP Drain and Accuracy up to 11.

osu!catch

• Circle Size (0–10, default: CS of selected beatmap): Change the circle size to a specific value.
• HP Drain (0–10, default: HP of selected beatmap): Change the HP drain rate to a specific value.
• Accuracy (0–10, default: OD of selected beatmap): Change the overall difficulty to a specific value.
• Approach Rate (0–10, default: AR of selected beatmap): Change the approach rate to a specific value.
• Spicy Patterns (default: disabled): Increase the difficulty of some patterns as if Hard Rock (HR) is enabled.
• Extended Limits (default: disabled): Allows the user to increase Circle Size, HP Drain, Accuracy and Approach Rate up to 11.

osu!mania

• HP Drain (0–10, default: HP of selected beatmap): Change the HP drain rate to a specific value.
• Accuracy (0–10, default: OD of selected beatmap): Change the overall difficulty to a specific value.
• Extended Limits (default: disabled): Allows the user to increase HP Drain up to 11 and to adjust Accuracy between -15 and 15.

Scoring

osu!

In osu!, Difficulty Adjust has a score multiplier of 1.00x by default.

For each parameter (CS, HP, AR, OD), an individual multiplier is calculated as follows: For each 0.1 change of that parameter (in either direction), the multiplier decreases by 0.05x (starting from 1.00x, to a minimum of 0.10x).

The final multiplier is then calculated as the product of the individual multipliers of all parameters, but cannot be lower than 0.10x.

Thus, if A₁, A₂, A₃ and A₄ denote the selected CS, HP, OD and AR and B₁, B₂, B₃ and B₄ denote the beatmap's CS, HP, OD and AR, the score multiplier is given by the following formula:¹

Difficulty Adjust score multiplier in osu!

In any case, this multiplier is at least 0.10x and at most 1.00x.

Example

To illustrate, consider a beatmap with the following parameters and these Difficulty Adjust settings chosen by the user:

In this case, CS was decreased and AR was increased, while the other two values remain unchanged. Therefore, HP and OD get a multiplier of 1.00x and we have the following penalties:

• CS penalty: 1.0 - 0.5 * |3.5 - 4.0| = 0.75
• AR penalty: 1.0 - 0.5 * |9.5 - 9.2| = 0.85

Thus, the final score multiplier in this case is 0.75 * 0.85 = 0.6375x.

Other game modes

In osu!taiko, osu!catch and osu!mania, Difficulty Adjust has a score multiplier of 0.50x.

References