Gaming system and method providing additional award opportunity based on a plurality of accumulated designated symbols

1. A gaming system comprising:

a housing;

at least one processor;

at least one display device supported by the housing;

a plurality of input devices supported by the housing and including an acceptor; and

at least one memory device storing a plurality of instructions which, when executed by the at least one processor, cause the at least one processor to:

establish a credit balance based at least in part on a monetary value associated with a physical item responsive to receipt, by the acceptor, of the physical item;

cause the at least one display device to display a designated symbol accumulation area including a plurality of designated symbol positions;

for a play of a game associated with a set of multiple symbols including a designated symbol:

place a wager responsive to receipt, by one of the input devices, of a wager input, the credit balance decreasable by the wager;

randomly determine and cause the at least one display device to display a plurality of the symbols of the set of symbols at a plurality of symbol display areas;

responsive to determining that the designated symbol is displayed at one of the symbol display areas, accumulate and cause the at least one display device to display the designated symbol at one of the designated symbol positions of the designated symbol accumulation area, wherein each accumulated designated symbol is associated with a designated period;

responsive to determining that an accumulated designated symbol is displayed at one of the designated symbol positions:

determine a modifier based on the accumulated designated symbols displayed at the designated symbol positions;

determine any awards based at least in part on the modifier and the symbols displayed at the symbol display areas;

cause the at least one display device to display any determined awards; and

increase the credit balance based on any determined awards or modified awards;

before a next play of the game, for each of any accumulated designated symbols:

determine whether the designated period associated with said accumulated designated symbol has expired,

responsive to determining that the designated period associated with said accumulated designated symbol has expired, cause the at least one display device to remove said accumulated designated symbol from the designated symbol position at which said accumulated designated symbol is displayed; and

responsive to determining that the designated period associated with said accumulated designated symbol has not expired, cause the at least one display device to move said accumulated designated symbol to another one of the designated symbol positions; and

initiate a payout associated with the credit balance responsive to receipt, via one of the input devices, of a cashout input.

2. The gaming system of claim 1 , wherein the designated periods associated with at least two accumulated designated symbols overlap.

3. The gaming system of claim 1 , wherein the designated periods associated with at least two accumulated designated symbols are the same.

4. The gaming system of claim 1 , wherein the designated periods associated with any accumulated designated symbols are one of: (a) a designated period of time, and (b) a designated quantity of plays of the game.

5. The gaming system of claim 1 , wherein the value of the modifier increases as a quantity of designated symbols included in the displayed symbols increases.

6. A method of operating a gaming system, said method comprising:

receiving, by an acceptor of the gaming system, a physical item associated with a monetary value;

establishing, by at least one processor, a credit balance based at least in part on the monetary value associated with the received physical item;

causing, by the at least one processor, at least one display device to display a designated symbol accumulation area including a plurality of designated symbol positions;

for a play of a game associated with a set of multiple symbols including a designated symbol:

placing, by the at least one processor, a wager following receipt, by an input device, of a wager input, the credit balance decreasable by the wager;

randomly determining, by the at least one processor, and causing, by the at least one processor, the at least one display device to display a plurality of the symbols of the set of symbols at a plurality of symbol display areas;

responsive to determining that the designated symbol is displayed at one of the symbol display areas, accumulating, by the at least one processor, and causing, by the at least one processor, the at least one display device to display the designated symbol at one of the designated symbol positions of the designated symbol accumulation area, wherein each accumulated designated symbol is associated with a designated period;

responsive to determining that an accumulated designated symbol is displayed at one of the designated symbol positions:

determining, by the at least one processor, a modifier based on the accumulated designated symbols displayed at the designated symbol positions;

determining, by the at least one processor, any awards based at least in part on the modifier and the symbols displayed at the symbol display areas;

causing, by the at least one processor, the at least one display device to display any determined awards; and

increasing, by the at least one processor, the credit balance based on any determined awards or modified awards;

before a next play of the game, for each of any accumulated designated symbols:

determining, by the at least one processor, whether the designated period associated with said accumulated designated symbol has expired;

responsive to determining that the designated period associated with said accumulated designated symbol has expired, causing, by the at least one processor, the at least one display device to remove said accumulated designated symbol from the designated symbol position at which said accumulated designated symbol is displayed; and

responsive to determining that the designated period associated with said accumulated designated symbol has not expired, causing, by the at least one processor, the at least one display device to move said accumulated designated symbol to another one of the designated symbol positions; and

initiating, by the at least one processor, a payout associated with the credit balance following receipt, by one of the input devices, of a cashout input.

7. The method of claim 6 , wherein the designated periods associated with at least two accumulated designated symbols overlap.

8. The method of claim 6 , wherein the designated periods associated with at least two accumulated designated symbols are the same.

9. The method of claim 6 , wherein the designated periods associated with any accumulated designated symbols are one of: (a) a designated period of time, and (b) a designated quantity of plays of the game.

10. The method of claim 9 , which is provided through a data network.

11. The method of claim 10 , wherein the data network is an internet.

12. The method of claim 6 , wherein the value of the modifier increases as a quantity of designated symbols included in the displayed symbols increases.

13. A gaming system comprising:

at least one processor; and

at least one memory device storing a plurality of instructions which, when executed by the at least one processor, cause the at least one processor to:

cause at least one display device to display a designated symbol accumulation area including a plurality of designated symbol positions;

for a play of a game associated with a set of multiple symbols including a designated symbol:

randomly determine and cause the at least one display device to display a plurality of the symbols of the set of symbols at a plurality of symbol display areas;

responsive to determining that the designated symbol is displayed at one of the symbol display areas, accumulate and cause the at least one display device to display the designated symbol at one of the designated symbol positions of the designated symbol accumulation area, wherein each accumulated designated symbol is associated with a designated period;

responsive to determining that an accumulated designated symbol is displayed at one of the designated symbol positions:

determine a modifier based on the accumulated designated symbols displayed at the designated symbol positions;

determine any awards based at least in part on the modifier and the symbols displayed at the symbol display areas; and

cause the at least one display device to display any determined awards; and

before a next play of the game, for each of any accumulated designated symbols:

determine whether the designated period associated with said accumulated designated symbol has expired;

responsive to determining that the designated period associated with said accumulated designated symbol has expired, cause the at least one display device to remove said accumulated designated symbol from the designated symbol position at which said accumulated designated symbol is displayed; and

responsive to determining that the designated period associated with said accumulated designated symbol has not expired, cause the at least one display device to move said accumulated designated symbol to another one of the designated symbol positions.

14. The gaming system of claim 13 , wherein the designated periods associated with at least two accumulated designated symbols overlap.

15. The gaming system of claim 13 , wherein the designated periods associated with at least two accumulated designated symbols are the same.

16. The gaming system of claim 13 , wherein the designated periods associated with any accumulated designated symbols are one of: (a) a designated period of time, and (b) a designated quantity of plays of the game.

17. The gaming system of claim 13 , wherein the value of the modifier increases as a quantity of designated symbols included in the displayed symbols increases.

18. The gaming system of claim 13 , wherein the display device is part of a mobile device.