ive only recently gotten back into playing games again but the few that im obsessed with are:
Monkey ball for the game cube
its mindless and its kinda like a marble madness game, you just get the monkey to the goal without falling off the edge, it also has other games on it like bowling, golf, and billards that are good to play when you really dont want to think and are bored with nothing else better to do. you can also play up to 4 people but dont need 4 controllers, depending on what game you play on it.

Monkey ball 2: it is basically the same as the first one, but with alot of better graghics and more options for games. it is also more challenging in the main game.

luigi's mansion for game cube: this game can get annoying since there are too many buttons you have to hit iin a certain order to do what you need to do, but once you get used to it, it can be pretty fun, this game makes you think, somewhat, to kill some of the ghosts in the mansion, you have to figure out certain clues to get to them first, of course there is alot of going back and forth, but i get annoyed with the game enough it becomes an obsession for me, i hate not being able to figure things out....

Dracula ressurection for the playstation: this game you dont kill anyone in it... at least i havent yet... but its intresting to me because you have to think, the object of the game is to reach draculas castle to save Mimi (not sure how to spell) and you have to find different clues and objects to get there, there is alot of back tracking, and the game can get annoying if you dont know what it is you are looking for or what you need to do, but once you figure it out it makes it better and you can give yourself a pat on the back or whatever for figuring it out.... i dunno, i just like it..

ummm think thats it for now.... like i said its only been recently that i have gotten back into playing games... oh the zelda game for the 64 is also pretty good, havent played it in a while though...