Dōjin soft (同人ソフト, Dōjin soft?), also sometimes called dōjin games (同人ゲーム, dōjin games?), 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 Fan Games. Most of them are based on pre-existing material, but some are entirely original creations. They are almost always exclusive to the PC, but a few notable exceptions also exist for the Dreamcast, because of its very weak copy protection.