Cascade

Preview osu!mania maps online

Want to see a beatmap without launching osu!? Cascade is a free osu!mania map viewer that runs in the browser: drop an .osz onto the page and the map plays on a vertical scrolling playfield with the song, real osu! hitsounds, background image or video, and even your own .osk skin.

Drop a map here to open it in Cascade or click to choose an .osz, .osu, .sm, .qua or .mc file

The file goes straight from your computer into the editor in this browser; nothing is uploaded. Or open the editor and drop it there.

How it works

Drop any .osz onto this page, or onto the Cascade editor itself.
Press Space to play. Scrub the timeline, change playback speed (25% to 100%), or jump between bookmarks and kiai sections.
Switch difficulties in the sidebar to compare charts in the same set.

Viewer features

Every keymode from 1K to 18K, with long notes, SVs and BPM changes rendered accurately
Playtest mode: play the map with your keyboard, with judgements, combo and accuracy
Waveform timeline, per-difficulty star rating and a PP counter
Skin support: load an .osk to see the map with your own note style
Slow-motion playback for reading dense patterns

More than a viewer

Cascade is a full online osu!mania editor: the same page lets you fix a note, retime a section, or convert the map to StepMania / Etterna and export it back out as .osu, .osz or .sm. If you are new to mapping, start with the guide on how to make an osu!mania map.