DJMax Portable Black Square (Korean: 디제이맥스 포터블 블랙 스퀘어, dijeimaegseu poteobeul beullaeg seukweeo; abbr.: DMP:BS) is a music game for the PlayStation Portable developed by South Korean developer Pentavision released on December 24, 2008. This is the fourth major game of the DJMax series released for the PSP. The game includes various enhancements and new features built on from DJMax Portable 2 and DJMax Portable Clazziquai Edition.