Rhythm Forge
Turn any song into a playable web rhythm game
Keys D F J K ／ or tap the 4 lanes on mobile
Ranking criteria
| SSS | All PERFECT |
|---|---|
| SS | Accuracy ≥ 98% |
| S | Accuracy ≥ 93% |
| A | Accuracy ≥ 85% |
| B | Accuracy ≥ 75% |
| C | Accuracy ≥ 60% |
| D | Accuracy < 60% |
| FC | Full Combo (0 Miss) |
| AP | All PERFECT |
Keys D F J K ／ or tap the 4 lanes on mobile
0SCORE
100.00%ACC
D
· Normal
0
| PERFECT | 0 |
|---|---|
| GREAT | 0 |
| GOOD | 0 |
| MISS | 0 |
| Max Combo | 0 |
| Accuracy | 100.00% |
How to Play
What is this?
Upload any song and the app auto-analyzes its beats to generate a 4K falling-note chart. Everything runs locally in your browser — audio and charts never leave your device.
- Pick or drag in an mp3 / wav (or try the built-in demo)
- Wait a few seconds for beat analysis and chart generation
- Choose a difficulty (Easy / Normal / Hard) and hit Start
- Hit notes with D F J K keys, or tap the corresponding lane on mobile
- Hold long notes; release timing decides PERFECT, GOOD or MISS
Everything is computed offline and privately — your music never leaves the browser.