The Wii MotionPlus is an expansion device that allows the Wii Remote to more accurately capture complex motion. According to Nintendo, the sensor in the device supplements the accelerometer and Sensor Bar capabilities of the Wii Remote to enable actions to be rendered identically on the screen in real time. The Wii MotionPlus was announced by Nintendo in a press release on July 14, 2008, and revealed the next day at a press conference at the E3 Media & Business Summit. It will be bundled with the sports game collection Wii Sports Resort, which is scheduled for release in Spring 2009. The device will also be available for purchase separately. Games currently planned to feature Wii MotionPlus functionality are: Red Steel 2, EA Sports Grand Slam Tennis, and Tiger Woods PGA Tour 10.

The device incorporates a dual-axis "tuning fork" angular rate sensor, which can determine rotational motion. The information captured by the angular rate sensor can then be used to distinguish true linear motion from the accelerometer readings. This allows for the capture of more complex movements than possible with the Wii Remote alone.

The Wii MotionPlus features a pass-through expansion port, allowing other expansions such as the Nunchuk or Classic Controller to be used simultaneously with the device. The attachment has a color-coded mechanical slide switch for locking the clip release. When attached to the Wii Remote, the unit extends the length of the controller body by approximately 1½ inches (4 cm). Each Wii MotionPlus will be packaged with a longer version of the Wii Remote Jacket to accommodate the added length.

The Wii MotionPlus was developed by Nintendo in collaboration with game development tool company AiLive. The sensor used is an InvenSense IDG-600; designed in accordance to Nintendo's specification; with a high dynamic range, high mechanical shock tolerance, high temperature and humidity resistance, and small physical size.

Australian Release: Spring 2009