, also sometimes called , with dojin sometimes transliterated as doujin or doujinshi, are video games created by Japanese hobbyists or hobbyist groups (referred to as "circles"), more for fun than for profit; essentially, the Japanese equivalent of independent video games. Most of them are based on pre-existing material, but some are entirely original creations. They are almost always exclusive to Windows-based PCs, but a few notable exceptions also exist for the Dreamcast, a console on which homebrew development was popular.