IOSU is a rhythm game developed by Float32 Inc for iPhone users. This free game allows players to play with their own beatmap files, providing a unique and personalized gaming experience.

With IOSU, you can enjoy rhythm gameplay in two different modes: 4 Keys mode and 5x5 Keys mode. These modes offer different challenges and gameplay mechanics, catering to players of various skill levels.

One of the standout features of IOSU is the ability to upload your own beatmap files. To do this, simply connect your iPhone and PC or Mac to the same Wi-Fi network, then open the provided URL on your computer. From there, you can easily upload your OSZ files and start playing with your favorite songs and beatmaps.

While IOSU currently offers two modes, the developers have stated that more modes will be available soon, promising even more variety and excitement for players.

Overall, IOSU is a great choice for rhythm game enthusiasts who want to play with their own beatmap files. Its intuitive gameplay and customizable features make it a must-have for iPhone users who enjoy music and gaming.