墨球又叫笔迹球，是在Windows Vista中添加的一项电脑游戏，包含在入门版、家庭基本版、家庭高级版、商业版、企业版和旗舰版中，最初是出现在Windows XP Tablet PC Edition 2005中。游戏玩法为使用手写板或鼠标，借由画线让球直接进入相应颜色的洞中。在Windows XP Tablet PC Edition中，需要灵活地使用手写板，而鼠标指针在游戏窗口中是隐藏的，不过按两下Alt键，鼠标指针就会出现在游戏窗口中。在Windows Vista中，该游戏也可用鼠标操作。

在Windows 7中该游戏被取消。

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. In Windows Vista, it can also be played using the mouse.