project-riz/osu-beatmaps

osu! Beatmaps Dataset (WebDataset)

A collection of ranked/loved osu! beatmaps with audio and chart data, in WebDataset format.

Dataset Variants

Variant	Audio Format	Description
original	MP3/OGG/WAV	Full quality original audio files
compressed	64kbps Mono Opus	Compressed audio for smaller download

from datasets import load_dataset

# Load original audio variant
ds = load_dataset("project-riz/osu-beatmaps", "original", streaming=True)

# Load compressed audio variant
ds = load_dataset("project-riz/osu-beatmaps", "compressed", streaming=True)

Statistics

Metric	Value
Total beatmaps	213,068
Unique audio tracks (samples)	46,386
Total audio duration	2,526 hours
Total beatmap playable length	8,419 hours
Date range	2007-10-06 to 2025-12-31

Sample Structure

Each sample represents one unique audio track with all its associated beatmaps:

{seq_num:06d}.mp3|opus    # Audio file
{seq_num:06d}.json        # Metadata + embedded beatmap charts

JSON Schema

{
  "audio_hash": "sha256_hash_of_audio",
  "audio_length": 167.92,
  "beatmaps": [
    {
      "beatmapset_id": 1,
      "beatmap_id": 75,
      "approved": 1,
      // ...
      "content": "osu file format v14\n..."
    }
  ]
}

Audio files are deduplicated by SHA256 hash. Multiple beatmaps sharing the same audio are grouped into a single sample. In both variants, the hash refers to the original audio.

In adherence to WebDataset conventions, all original audio files share the extension .mp3 regardless of their actual format.

Metadata Fields

Most fields are taken from the osu! API v1 response. The content field contains the full .osu beatmap chart file (UTF-8 encoded).

License

This dataset contains user-generated content from osu! and is subject to the osu! Terms of Service. The beatmap charts are created by community mappers and the audio tracks are copyrighted by their respective owners.

This dataset is provided for research purposes only.