Game system and game control method

A game control method for a game system that comprises a first game execution step of executing a first game in which at least one option is selected from a plurality of options, and a second game execution step of executing a second game in which a progression of game changes on the basis of a game result of the first game, wherein:

• the second game execution step comprises:
• a region data generation step of generating region data for arranging a plurality of selectable regions that are linked to the plurality of options, in a plurality of game progression regions that are displayed in a predetermined array upon a game screen of the second game;
• an acquired region data updating step of, on the basis of the option selected by the first game execution step, updating the region data so as to set the game progression regions as being acquired regions;
• and
• a prize awarding step of awarding a prize on the basis of the overall size of the acquired region;
• and the acquired region data updating step comprises:
• a selected acquired region setting step of setting a selectable region that is linked to the selected option as being an acquired region;
• a positional condition determination step of determining whether or not the selectable region that has been set as an acquired region and the game progression regions around that selectable region satisfy a predetermined positional condition;
• and
• a chained acquired region setting step of, on the basis of the result of determination by the positional condition determination step, setting a game progression region that is in a predetermined positional relationship with the selectable region as being an acquired region.