Cascade
Play your osu!mania map without leaving the editor
The slowest part of mapping is finding out whether a pattern actually
feels good. Normally that means exporting, opening the game, loading
the set, playing, then coming back. Cascade removes the round trip:
press F5 and the chart you are editing becomes playable
immediately, in the same tab, at the same timestamp.
Real judgement, not an approximation
The playfield uses the osu!mania judgement windows derived from your map's overall difficulty, so a run tells you something true about the chart. Hits are graded MAX, 300, 200, 100, 50 or miss, long note releases get their own wider window, and the numbers you get back are the ones you would get in game.
What the run tells you
- Accuracy and combo while the run is going, not just at the end.
- Unstable rate and mean hit error, so you can see whether a section is genuinely hard or just badly timed.
- Live NPS and peak NPS, which turn a vague feeling of density into a number you can compare between sections.
- A pp estimate for the difficulty as you write it.
Practise at any rate
Runs can be played anywhere from 0.75x to 2x. Slowing a burst down until you can actually read it is the fastest way to tell whether it is unfair or just unfamiliar, and speeding a calm section up exposes patterns that fall apart under pressure. The judgement windows scale with the rate exactly as the game scales them.
Playtest is a mapping tool, not a score submission. Nothing leaves your browser and no run is uploaded anywhere.
Then keep working
Press F5 again and you are back in the editor at the same
point, ready to move the note that just felt wrong. When the chart
plays the way you want, export a .osu or .osz,
or carry on with scroll velocity and
a full map check.