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• Rand(osu!)
• How to use
• How to use like a GAMER
• Disclaimer
• Arguments
  • Seed
  • osu!standard & osu!catch
    • True Random
    • Min Scale Factor & Max Scale Factor
    • Chance of Red Anchors
  • osu!taiko
    • True Random
    • Proportion of Switching Colors
  • osu!mania
    • Scatter
    • Avoid Jacks "x" and Shorter
    • Proportion of Switching Columns
• Result File Names / Difficulty Names Syntax
  • osu!standard & osu!catch
    • True Random Off
    • True Random On
  • osu!taiko
    • True Random Off
    • True Random On
  • osu!mania
    • Scatter Off
    • Scatter On

Table of contents generated with markdown-toc

Rand(osu!) is a Python3 program that randomizes patterns in any maps in any gamemodes.

Drag an .osu file into randosu.py / randosu.exe and follow the instructions.
Like this:

1. I want Mirror Mod in osu!taiko
   Set Proportion of Switching Colors to 100% and you'll have a "Mirror" mod in Taiko.

2. I Despise Jacks in osu!mania
   Enable Scatter and set Proportion of Switching Columns to 0% to keep the original pattern AND replace as many jacks as possible.

3. I want a minijack challenge in osu!mania
   Disable Scatter and adjust Proportion of Switching Columns like below:
   Set higher for chords-oriented maps and set lower for stream-oriented maps.

• Easy: 5~10%
• Normal: 10~25%
• Hard: 20~40%
• Insane: 30~60%
• Torture: 100% (Official games use this)

4. Mapping is so bothersome
   Place notes randomly on the screen but on the beat, and then run this program! :D

• Please drag only one .osu file at a time!
• Randomized result may differ by program version even with the same seed and arguments.
• Sliders might go out of bounds on osu!standard. Working on a fix.

• Default: Current Timestamp
• Seed is used to initialize a random number generator. That means the same seed will create the same .osu file if used with the same arguments.
• If left blank, Rand(osu!) will use the current timestamp as the seed.

• Recommended: Off
• Rand(osu!) uses original map as a reference so that it won't create an absolute mess. Details are written below.
• This option will ignore all that and create a truly chaotic masterpiece.

• Default: 0.8x ~ 1.5x
• Rand(osu!) calculates the distance between the objects as a reference, multiplies a random number to it, and then use the result to place the next object.
• These arguments will specify the random number's range.

• Default: 25%
• Rand(osu!) will first read all the slider curve points as normal anchors. It will then change some of the points to a red one, which will add to the chaos.
• This argument specifies the chance of changing a curve point into a red one.

• Recommended: On
• Rand(osu!) adopts the randomization algorithm from official taiko games, which takes 20%/50%/100% of the original notes and switches color.
• This will theoretically randomize the map enough, but because of its mechanism, some original patterns might appear in a row unchanged.
• This option will randomly select the color of notes by itself without referencing the original beatmap, which may output a better result.

• Default: 50%
• Rand(osu!) will keep the size of all notes and only change the color of some.
• This argument controls the proportion of notes to change.
• In official taiko games, the proportions are:
  • Abekobe(あべこべ): 100% - Mirror
  • Detarame(でたらめ): 50% - Random
  • Kimagure(きまぐれ): 20% - Semi-random

• Recommended: On
• In Lunatic Rave 2, there's a special option called Scatter, which is just like S-Random, except it avoids jacks 16th and shorter at all costs.
• This works the exact same in Rand(osu!), except you can customize the snap value with the argument below.
• To compare with beatmania IIDX, Scatter Off is S-RANDOM, and Scatter On is H-RANDOM.

• Default: 1/4

• As mentioned above, Scatter displaces notes in order to avoid jacks equal or shorter than the snap value.

• This argument sets said value, which makes practicing 1/4 minijacks with shitty 1/8 jacks removed possible.

• "Snap" is a terminology used in osu!mania mapping, which divides a single beat with equal lengths.
  Here's a comparison with "Beat" or "Note" used in other rhythm games, which divides a single bar with equal lengths.

  • 1/1 Snap = 4th Beat/Note
  • 1/2 Snap = 8th Beat/Note
  • 1/4 Snap = 16th Beat/Note
  • 1/8 Snap = 32nd Beat/Note
  • 1/16 Snap = 64th Beat/Note
  • 1/3 Snap = 12th Beat/Note
  • 1/6 Snap = 24th Beat/Note
  • 1/12 Snap = 48th Beat/Note

• Default: 100%
• Rand(osu!) will displace notes to other available columns.
• This argument specifies the proportion of changing the column of a given note.
• The lower the value, the easier the map usually gets.

Randomized .osu files will be created right where your original .osu file is. Here's what the names of the generated files mean.

• Difficulty name: Randomized(Min Scale Factor~Max Scale Factor, Red:Chance of Red Anchors)_Seed_Original Difficulty Name
• File name: rand(Min Scale Factor~Max Scale Factor,Chance of Red Anchors)_Seed_Original Difficulty Name.osu

• Difficulty name: TrueRandomized(Red:Chance of Red Anchors)_Seed_Original Difficulty Name
• File name: truerand(Chance of Red Anchors)_Seed_Original Difficulty Name.osu

• Difficulty name: Randomized(Proportion of Switching Colors%)_Seed_Original Difficulty Name
• File name: rand(Proportion of Switching Colors)_Seed_Original Difficulty Name.osu

• Difficulty name: TrueRandomized_Seed_Original Difficulty Name
• File name: truerand_Seed_Original Difficulty Name.osu

• Difficulty name: Randomized(Proportion of Switching Columns%)_Seed_Original Difficulty Name
• File name: rand(Proportion of Switching Columns)_Seed_Original Difficulty Name.osu

• Difficulty name: Scattered(Proportion of Switching Columns%, No 1/Snap Jacks)_Seed_Original Difficulty Name
• File name: scat(Proportion of Switching Columns,Snap)_Seed_Original Difficulty Name.osu