Pick features show a set of hidden prizes and let the player choose until a collect symbol appears, while wheel features spin a prize wheel on top of the reels. The choice in a pick game feels decisive, and in most games the prize is already set by the result of the triggering spin. Reading the feature rules shows the range of prizes on offer and whether any choice changes the outcome in any way.
Scatter symbols pay wherever they land, with no need to sit on a line, and three or more of them usually trigger the main feature. Some games need the scatters on specific reels, others count them anywhere on the grid. A scatter win is typically calculated on the total stake instead of a single line. The number of scatters needed, and what each extra one adds, is stated in the rules of the feature.
A wild symbol stands in for other symbols to complete a winning combination, usually with the exception of scatters and bonus symbols. Many games add a twist: wilds that expand to fill a whole reel, stay in place for several spins, move across the grid or carry a multiplier. The paytable shows which version a game uses and whether a line completed by a wild pays at the normal rate or at a boosted one.