The Nintendo 3DS game console that was released in Britain last week has led to complaints from hundreds of buyers who said they felt dizzy after playing on the system.
The new Nintendo 3DS console can be played without using special 3D glasses. Separate images are flashed into each eye, tricking the brain into creating a sense of depth.
But gamers posted complaints of dizziness, headaches and sickness on gadget websites and Twitter after playing the hand-held device for just a few minutes, The Sun reported.
Some even said they saw web pages in 3D after switching from the console to a computer.
One user said: "The 3D gave me a headache, so I hated it."
Another tweeted: "Bumped into a friend and we played with a 3DS but it made both of us feel ill."
Japanese giant Nintendo earlier issued a warning that the console was not safe for children under the age of seven.
"When viewing any kind of 3D images, some people might experience minor discomfort. The effects are short-term and have no lasting effect," a Nintendo spokesman said.
Nintendo said the 3D effect can be scaled back or turned off. It advised players to take a break every 30 minutes.