What is a casual game?

[Jay520]

Stinky said:

There aren't many games that could garner the player commitment, game mechanics study and competitiveness of a game like Ms Pac-Man, let alone the other mountain of coin-op games. Yet these games which still recieve player commitment 30 years later are to be considered casual, where a one/two playthrough game with a thick manual is to be considered hardcore?

Just because it is more casual doesn't mean it's not more hardcore at the same time.