I wouldn't say jouvenile. Casual are simple to play, original ones that succeed are engaging and sometimes fun. They basicly rely on simplicity to anyone with a smidgen of intelligence can play them without instructions after a couple of trys. They also appeal to non gamers that just want to do something to waste a couple of minutes of their time without getting bored.
Mainstream games are more involved, often story based and designed to immerse you in some other fantasy situation with a fairly high level of control and interaction that requires skill and training of some kind, often through familiarity with other games and controllers. Someone not familiar with them may struggle to get around and probably wouldn't be able to get the whole thing within a couple of minutes.
Mainstream games are more involved, often story based and designed to immerse you in some other fantasy situation with a fairly high level of control and interaction that requires skill and training of some kind, often through familiarity with other games and controllers. Someone not familiar with them may struggle to get around and probably wouldn't be able to get the whole thing within a couple of minutes.