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Codename beatoraja is a Cross-platform rhythm game based on Java and libGDX. It works on Windows, Mac OS, and Linux.


  • 3 types of Long Note mode : Long Notes, Charge Notes, Hell Charge Notes, and Back Spin Scratch like iidx
  • show note timing duration (like iidx green number), judge details (fast/slow or +-ms)
  • 8 types of groove gauge (ex. assist-easy, ex-hard, ex-grade)
  • 11 types of clear lamp (ex. assist, light-assist, ex-hard, perfect, and max)
  • real-time play speed controller (x0.25 - x4.0. auto play mode, replay mode only)
  • various assist options : legacy note, expand judge, bpm guide, and no mine
  • pms judge (max 1 miss / 1 notes, combo is reset when miss)
  • support bmson 0.2.1, 1.0.0
  • practice mode
  • import difficulty table folder, create course with various constraint (mirror/random OK, no hispeed, and so on)
  • import LunaticRave2 skin (now working in progress. not supporting DirectXArchive(.dxa) and DirectDrawSurface(.dds) file)
  • import LunaticRave2 scores (clear lamp, score. not including score verifier like scorehash)

System Requirement

  • Java Runtime Environment 1.8.0 64bit (32bit is not recommended)
  • OpenGL 3.1- (may not work under Windows 10 + Intel HD Graphics 2000/3000. See also LWJGL/lwjgl#119)

How To Use

java -jar beatoraja.jar -(a|p|r1|r2|r3|r4|s) [BMS path]

  • options
    • a : autoplay
    • p : practice
    • r1-r4 : start replay data 1-4
    • s : skip configuration

beatoraja uses a large amount of heap memory. So it is recommended that you use options of extending heap memory : e.g. -Xms1g -Xmx4g.

On JRE 32bit, maximum heap memory size is limited to 1.4G-1.6G. See

Don't use this application for playing copyrighted contents.


  • GNU General Public License v3