Recommend me some games for my sister

here :D

PopCap games

Faerie Solitaire

Rayman Legends

Don't leave all the fun for your sister, let the whole family join in. :)

Hello Kitty Online

Plants VS Zombies.
It's cute, easy to learn and it got my g/f into Steam games.

I'd recommend stuff with fun local multiplayer. Monaco is a great game for many people and can be played both local and online. It may be a bit too hard for your sister. Something like Speedrunners could be fun if she likes Mario Kart...

If she likes Candy Crush, I'd recommend getting her something like Puzzle Quest, which is similar but more substantial. It's a bit geeky and she may not like the fantasy angle, but it's worth a look.

Broken Age is a beautiful point and click adventure... It's "not over" yet, but I think she'd enjoy the story and the fact that one of the main characters is a great girl.

G'luck with this!

If ur sister is ok with strategy, long live the queen might be good. If shes into simulations, game dev tycoon maybe?(WARNING: ther are alot of bad simulations, so read the reviews be4 buying smth simulation related. If shes the type to fancy herself some fps,call of duty do not get, try verdun, its community is actually quite nice. And also if ur buying the games, try tf2 outpost. Most games exept pre-releases and call of duty sell at a lower price there. Hope this worked for you. :)

foul play

castle crashers

creavures

faerie solitaire

costume quest

shufflepuck cantina deluxe

dr.who the adventures

dr.who the eternity clock

machinarium

fairy bloom freesia

lume

little inferno

on the rain-slick precipice of darkness

pap & yo

pid

psychonauts

recettear: an item shop's tale

snapshot

stacking

tiny and big : grandpa's leftovers

worms?

leisure suit larry? :P JK SimCity perhaps?

Bad rats obviously :P

AudioSurf

Dust: An Elysian Tale

Guacamelee

Beatbuddy: Tale of the Guardians

Procyon

Symphony

Clickr

Grimm

Giana Sisters: Twisted Dreams

BIT.TRIP Presents... Runner2

L4D2 :D

show her silent hill! so she wont bother u anymore :D

Taz Wanted

Terraria is easy enough to get into. It's only as complex as she wants to make it, depending on how deep she gets into it. And you can play with her on the same map, guiding her through some places while she gets used to the controls.

The Secret of Monkey Island

This:
http://store.steampowered.com/app/263180/

Castle of Illusion (a remasterized Disney game from Genesis) - http://store.steampowered.com/app/227600/

Gardens Inc. - http://store.steampowered.com/app/279420/

The Powerpuff Girls: Defenders of Townsville - http://store.steampowered.com/app/274450/

Squirt's Adventure - http://store.steampowered.com/app/263180/

My favourites were mostly classic point and click adventures, plus I enjoyed the occasional fps like Doom, Redneck Rampage, and Duke Nukem 3D (but I guess that's not the best idea for her..?). As some others have mentioned, tycoons like Rollercoaster or Zoo Tycoon might be up her alley since she seems to like building/creative games (I also used to enjoy those!). Platformers/puzzle platformers might be fun for her too. Here's a list of some that are on steam and are probably age-appropriate:

Action: Bastion, Dust, Guacamelee!

Adventure: A New Beginning, The Book of Unwritten Tales + Critter Chronicles, Broken Age, The Cave, Kaptain Brawe, Machinarium, Monkey Island 1 + 2 + Tales, The Night of the Rabbit, Stacking, Syberia + 2, Tiny Thief, The Whispered World

Puzzle/platformer (she might need your help with some of these): Escape Goat + 2, FEZ, Pid, Portal + 2, Spirits, Toki Tori + 2, Trine + 2

RollerCoaster Tycoon 1 or 2. Even thought it's a little complicated at first, I had so many hundred of hours of fun with the game in my early gaming age...

My sister is 9 and she likes to play Super Hexagon. And my job as an older brother is to let her play but never allow to beat my record.
Same goes to Tetris. She will never beat Marathon!!! MUAHAHAHAHAHAHAHA!!!!!

Double Fine's games are good :)

Any Sonic game.

Luxor