Games for old people?

My new computer seems to finally be working (it's been randomly freezing; I'll give it a few more days until I declare it stable), so my old computer is getting transferred to my parents.

Right now they have a rusty piece of crap that's based on turn-of-the-millennium technology. As such, it can't play anything more than Plants vs. Zombies, some Breakout clones, Mahjongg, Peggle, etc.

So, with a newer computer, they should be able to play something a little more demanding. I just don't know what, but I definitely need to stop the "OMG we need different games, we're bored" complaints.

They can't play any flashy arcade stuff that requires fast reflexes. Mouse is fine. Arrow keys and spacebar is fine. Anything more than that, like a mouse+keyboard combination, or more keys - nope, too much for old people.

Complex adventure games are also out of the question. English is fine in very small amounts. I tried Botanicula, but it ran at like 3 fps on that computer. That said, the games should have high replayability, so my attempt to give them Botanicula was just novelty; it's not a valid solution to their gaming problem.

Father had no use for old NFS: Underground. Too fast. So that takes racing games out of the equation as well.

The computer is in the same room as the TV. Games that rely on sound are also unacceptable.

Do you have any suggestions? What do your parents and grandparents play?

EDIT

Tried and failed: World of Goo, Crayon Physics, The Sims

Will try: Angry Birds, Cogs, Little Inferno, Zuma, Faerie Solitaire, Reach For the Sun

Tried and working: Bejewelled (forgot to mention it when posting), Farm Frenzy, Plants vs. Zombies, Peggle, mahjongg, "match 3", breakout