As the name suggests, this game is about colors, not shapes. Single blocks fall down, and rows (3+) of identical color vanish. At the first glance, the game seems dull, as there is no noticeable increase of difficulty. But quickly, it becomes pretty addictive. Coltris was created by Mike Wiering, but is no longer available from his website. According to a forum post, he had completely forgotten about it. In 2005, he got an e-mail from someone who was addicted to it and made a Windows version, which he linked in that post. Below is the original DOS version.