Twenty-one OS is a newer, higher quality OS that was originally meant to proceed Crazy_OS. It features new apps, a new color theme, and improved graphics. In addition to this, it has a more organized layout that allows easier addition of new apps. The assistant on the taskbar is ready to help, and can open apps, play the music from the music app, and turn off the OS.
Update Log: V 2.2 - Updated Clock graphics, almost added a new taskbar feature but decided against it. V 2.3 - Updated Desktop animations, improved a glitch with the clock interface, added new features in the Paint App. Please tell me if you encounter any glitches! It would be a great help to me as I try to eliminate all the bugs in this OS.