A slot machine provides awards based upon matching two or more symbols drawn from the symbol matrix during one or more spins ("Pair'em Up"). In one embodiment:

• The game starts with an empty Pair'em Up window.
• At the end of every spin, the symbol appearing in symbol position 3/2 is duplicated into an empty section of the Pair'em Up window.
• If the newest symbol in the Pair'em Up window matches any of the other symbols in the Pair'em Up window, the two matching symbol are cleared from the Pair'em Up window.
• For each pair of matching symbols made during a Pair'em Up game, the player receives an escalating award based upon the Pair'em Up pay table.
• If the Pair'em Up window fills with 5 unmatched symbols, the game ends.