Three year olds love craft projects, so this is a “two for one”: make a craft, have a game to play.
You will need scissors, card stock and stickers. Simple. It was a snowy day when we made this game, and I didn’t have card stock at home, so I used a file folder I had in my old teaching stuff (nothing beats using what you already have). I cut it in 2″X2″ squares. Thankfully we have plenty of stickers (a bunch left over from teaching and some new ones too). I had enough matching My Little Pony stickers to make 6 pairs of cards.
Peanut loved getting to place each sticker carefully on the cards.
Another bonus of this make it yourself game: she can make new sets as her interests change, and her brother won’t be stuck with some “girly” game when he gets bigger.