InkBall is a computer game that is included with Windows XP Tablet PC Edition 2005 and Windows Vista except the Starter and Home Basic editions. It employs the use of a stylus or mouse to draw lines to direct balls into holes of corresponding colors. On Windows XP Tablet PC Edition, a pen tablet was required to play the game properly, as the mouse cursor was not visible inside the game window. However, pressing Alt twice while playing the game will cause the mouse cursor to show up.