The reels' symbols are usually themed and can be letters, numbers, fruits, or other pictures. Reels & paylines vary among machines; some have threall slots casino canadae reels & a single payline, while others have five reels and several paylines. In order to win rewards or activate bonus features, players try to match symbols across paylines. Wilds, scatters, & bonus symbols are examples of special symbols that improve gameplay and raise winning chances.