Every game will have its own set of “rules” – special wild symbols and winning combinations or pay lines. Some games will display these rules as the game opens and others not.
In all cases, you can review the rules within the game itself by hitting the “?” symbol found in the game display, or by hitting the “Pays”, “Pay lines”, “View Pays”, “info” or maybe even an “i” symbol (for information) – each game displays this link in a different way.