It's part of a three year agreement with television production company FremantleMedia. and enables the development of gaming content under the 'Britain's Got Talent' and 'The X Factor' brands, the firm said.
The site went live ahead of the show's broadcasting on Saturday night.
It follows the creation of games website Gaming Realms created for TV singing contest The X Factor last year, whose lead game is Slingo.
Chief executive of Gaming Realms Patrick Southon said: "In a short space of time Gaming Realms has managed to sign agreements with two of the most popular entertainment shows on British television.
"This latest agreement will open us up to a sizable new audience with whom we expect our bespoke Slingo format to be very popular."
Shares were unchanged at 20.5p.