Dan-Ball.jp is the main website for the Java games developed by ha55ii, such as Powder Game and Stick Ranger. It also features some optical illusions made with Flash. The site is primarily run by ha55ii, and one game that he programs is usually updated every Friday.
The site is available in three languages: English, Japanese and Chinese.
Game Search is a tool on the website that is used to search for games that are not on the Dan-Ball site itself. For additional features included within the games, it requires the user to sign up for an account. However, it is still possible to play games without one.
In Looking for mistakes, the player has to find the difference between two images called A and B. The game either flips between the two images with a small break in-between, or it blends very slowly from one image to the other and back.
Dan-Ball also features games made for mobile systems and wallpapers for the iOS and Android systems.
There are currently 17 mobile games available as downloadable apps.
There are currently 3 mobile web games available for the internet browsers in mobile systems. These can only be played in a mobile device, unless you change the browser's User Agent String. However, since 16 November, 2012, PC support is added to these games, and can be played in some internet browsers for computers without changing the internet browser's User Agent String.