The pjsekai in Scratch
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I’ll be adding more Project Sekai creations here!
#01 Project SEKAI COLORFUL STAGE!
- 5,346
- 4,415
- 530,225
- ©
- 2021.11.28

How to play
Action | Key |
---|---|
Hit 1st row | click D key |
Hit 2nd row | click F key |
Hit 3rd row | click J key |
Hit 4th row | click K key |

First, put in the song number. Then all you have to do is just keep hitting the looming notes (bars)!
Song list: Hello/How Are You? Patchwork Staccato, Charles, Hated by Life Itself, Time Machine, Happy Synthesizer, Dance Robot Dance, Dramaturgy, Otome Dissection, Hibana, Teo, Into the Night, Disappearance of Hatsune Miku.
#02 Endlessly practice hitting notes in Project Sekai Updated
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- 205
- 37,595
- ©
- 2022.7.31

How to play
Action | Key |
---|---|
Tap Notes | mouse click |
Tap Notes | DFJK Key |

This Scratch project uses a custom function called "split into lanes" to parse sheet music data - that's the heart of the game! It implements a recursive algorithm that splits text input by delimiters, distributing the musical data across four lanes. What's impressive is how it handles complex pattern recognition using just string manipulation.
With this approach, you can create and load your own chart data just like in Project Sekai, so you can play with original songs too. Once you grasp string processing and recursive algorithms, this technique becomes incredibly versatile for other games as well!
