Nintendo Co., maker of the Wii video-game system, sued accessory seller Nyko Technologies Inc. over what it says is a knock-off of the Nunchuk remote controller used with the popular system.

Nyko sells a wireless Kama Nunchuk designed to work with the Wii system. Nintendo contends the Nyko product copies its patented designs and infringes its trademarks for the Nunchuk name and packaging. The word ``nunchuk'' refers to a martial-arts weapon made from two sticks connected with a chain.

The Nyko product ``wholly appropriates the novel shape, design, overall appearance and even the color and materials used in the Nintendo Nunchuk controller,'' Nintendo said in the federal court complaint, filed June 10 in Seattle.