Specialist chain GAME says that pre-orders for Crackdown have risen by 25 per cent since Microsoft unveiled the initiative.
"Halo 3 is one of the most highly anticipated Xbox 360 titles for 2007 and our customers are hungry to get hold of it," commented, MD of GAME Group's online business.
"Halo 3 beta is a great way for gamers to actually influence the making of the game and will ensure the production of a truly amazing game," he added.
Crackdown, from developer Realtime Worlds, is due for release February 23 in Europe. Copies of the game which include the Halo 3 beta key will be housed in specially marked packaging.