At that age, it is not always a good idea to have a game where someone is a winner...they should all win.
At one of my son's parties, I gave each child a goody bag with, among other items, a pack of crayons and a coloring book. Ahead of time, I placed several colored stickers somewhere on the pages within each child's book. The game was simple...when I said GO they (with parental help) were to look through their book for the appropriate sticker (for example: the green star). Once they found the specified sticker the child was able to pick a wrapped gift from the basket. The gifts were small favor items, like dinosaurs and cars, etc. wrapped in tissue paper for just enough surprise.
There are enough gifts for everyone, so they all win!