Shares in Game Group Plc, the U.K.'s largest video-games retailer, fell the most in more than four months as analysts said a 25% rise in sales at stores open at least a year may not be sustained, reports Bloomberg News.

The company’s stock declined as much as 14%, despite the company reporting that revenue growth accelerated in the second quarter on demand for Nintendo Co.'s ``Wii Fit'' and ``Grand Theft Auto IV.''

``Despite this continuing strong performance, the current gaming cycle is going to peak at some point, as it has done with previous console generations,'' Landsbanki Securities analyst Mark Photiades wrote in a note. ``The current cycle has been extended by the number of consoles available, and because the Nintendo Wii has attracted substantial numbers of non-core gamers to the market.'' Photiades rates the stock