In its research, GameVision found there were big differences between the types of games that casuals liked compared to dedicated gamers.
The most popular games are Tetris and big recognisable titles like Fifa and Harry Potter.
"Casual gamers are big on brands that have come from outside the industry as it is something they know a little about, like a game based on a film or book," said Mr Dromgoole.
I guess Deer Hunter doesn't have the same appeal across the pond.