Mischief won the media relations account following a three-way pitch last week. It will focus on product placement in key lifestyle and gaming media.
The agency will also target bloggers and social media. Its account will initially run for three months.
A spokesperson for Mischief said: ‘We have been chosen for our consumer specialism. We will be emphasising its products' sleek design and price competitiveness, targeting youth.'
Mischief MD Mitchell Kaye leads the account.
France-based Guillemot operates in 12 countries. It designs interactive entertainment hardware and accessories for PCs and consoles. It owns the Thrustmaster gamepad brand, and was the first to market Nintendo's Wii accessories.