A videogame for my sister

Thomas Was Alone
Lumini
One Finger Death Punch
A Story About My Uncle
Broken Age
Bastion
Richard & Alice
Portal
Tomb Raider (My sister loves this one :D)
The Banner Saga
NOT A HERO

Could probably list more but this will do for now :D

Portal, Don't Starve Together if you want to play together, Fable is good.

Rayman Legends. Game goes for like $5 and is just incredible and very casual as well. Even has local co-op. Enjoy!

Also check out this video
https://www.youtube.com/watch?v=vpY8XOF12TA&ab_channel=MindsAblaze2

As a last minute, i learned she plays on Mac (because her boyfriend gave her one of his mac) so my choice were narrowed by the plateforme. I had though going with Life is Strange and Portal 2, and changed my mind.

Final choice is : Trinelogy, Portal 1 and 2, Stanley Parade, Walking Dead S1.

Most of all the suggestion you all make were good game i know most of them too, just wanted to know more about girl's taste as i don't know many girls who plays. Also, by casual i meant RPG, MMO; FPS, MOBA or even Coop is not her kind of game. She did plays Sims too when she was younger, but don't think she plays it anymore. I wanted more "story driven" game. If she could had played on Windows i would had definately buyed Life is Strange as the game was really one of the most cited.
As an answer for many, she don't play at all if not much, that's what i meant by casual. Sorry for not replying to everyone, i was on my phone when writing before and it was hard to write something long and was busy with family also, and i also get a lot of reply, didn't thought i would get that many.
Merry christmas to everyone !

Diablo 3? Would also vote for Portal 2

Life is Strange !

You mentioned she is a caual player.
Could you please give us some tips what she have played so far or what kind of games she like?

By the way if you have two PC at home you might invest in CO-OP games too.