Gaming machine with challenge feature

1. A gaming system operable to play a game comprising a base game and a feature game, the gaming system comprising:

a game controller for controlling the play of the base game and the feature game;

at least one display in data communication with the game controller to display game play of the base game and the feature game,

a player interface in data communication with the game controller to enable the player to control at least some aspect of game play of the game, the game controller controlling play of the feature game so that:

a) the feature game comprises at least one series of game events, in which a plurality of symbols from at least one predetermined symbol set that includes at least first and second symbols, are randomly selected and displayed on the at least one display, and

b) dependent on an outcome of the at least one series of game events, awarding a bonus,

wherein during play of the feature game, the game controller monitors at least the occurrence of the at least first and second symbols in the at least one series of game events and evaluates the occurrence of the at least first and second symbols against predetermined competitive criteria, wherein the outcome of the series of game events is dependent on said evaluation, and wherein the game controller awards the bonus at the conclusion of the at least one series of game events and wherein said predetermined competitive criteria comprise at least one of whether:

a) a predetermined symbol of the at least first and second symbols cumulatively occurs more or less frequently than the other at least first and second symbols; or

b) a predetermined symbol of the at least first and second symbols occurs a predetermined number of times before the other at least first and second symbols occur a predetermined number of times, and wherein the game controller is further operable to allow a player of the gaming system to determine which symbol from the at least first and second symbols is said predetermined symbol.

2. A computerised method of gaming using a system having a game controller, memory readable by the game controller, at least one display for displaying game images and a user interface to receive selections related to game play made by a player of the gaming system, the method comprising the steps of:

a) storing in said memory a definition of a predetermined set of symbols;

b) storing in said memory a definition of at least two special symbols from said predetermined set of symbols;

c) randomly selecting a plurality of symbols from said predetermined set of symbols and displaying the selected plurality of symbols on the at least one display;

d) determining the number of times each said special symbol occurs in the selected plurality of symbols;

e) repeating steps c) and d) at least once; and

f) dependent on an evaluation of the determination made in steps d) and e) and based on predefined competitive criteria, awarding a bonus to the player of the gaming system; and

allowing a player of the gaming system to use the player interface to select one of the special symbols and

maintaining in memory counters associated with the special symbols to record the determination made in steps d) and e), wherein step f) comprises

awarding the bonus to the player only when the value in the counter for said selected symbol after step e) has been completed is at least one of said predetermined competitive criteria:

a) greater than or less than the counters for the other special symbols; and

b) at or above a threshold amount before the counters associated with the other special symbols reach a respective threshold amount.

3. A computerised method of gaming using a system having a game controller, memory readable by the game controller, at least one display for displaying game images and a user interface to receive selections related to game play made by a player of the gaming system, the method comprising the steps of:

a) storing in said memory a definition of a predetermined set of symbols;

b) storing in said memory a definition of at least two special symbols from said predetermined set of symbols;

c) randomly selecting a plurality of symbols from said predetermined set of symbols and displaying the selected plurality of symbols on the at least one display;

d) determining the number of times each said special symbol occurs in the selected plurality of symbols;

e) repeating steps c) and d) at least once; and

f) in response to determinations made in steps d) and e) of the number of times a special symbol occur relative to the number of times another special symbol occur, awarding a bonus to the player of the gaming system; and wherein the bonus is selected from the set of:

i) a value determined and displayed at the commencement of the game feature;

ii) a linked or standalone progressive amount; and

iii) at, least one further series of game events comprising multiple repetitions of steps c) and d), and

wherein the bonus is a game in which at least one further series of game events comprising multiple repetitions of steps c) and d) and dependent on said evaluation, a second bonus is awarded, and wherein the counters are reset between play of the bonuses; and

g) decreasing the probability of the award of each subsequent bonus.