greenmedic88 on 22 February 2012
Put simply, it's a game with a low to no learning curve designed to be played in small doses, typically with simplified game design and gameplay.
It's still possible to play a casual game like a regular or core game just as much as it is possible to play them for hours and hours to the point where the player masters every little nuance and aspect of the game.
It's also possible to play any core game in a casual manner, which is to say it will probably never be finished and definitely never mastered.
