Game system, server system, processing method, and information storage medium

A server system comprising:

• a processor programmed to or an application-specific integrated circuit (ASIC) configured to:
• perform a game process;
• set a lottery range of a lottery process, the lottery range of the lottery process specifying a range of items among a plurality of items used during the game process that are subjected to the lottery process, wherein the plurality of items are stored in a memory in a data structure in which the plurality of items are linked so as to have one or more parent-child type relationships, and the lottery range is set so that a child item is included within lottery range of the lottery process when a parent item has been set to an acquired state or an acquirable state;
• change the lottery range of the lottery process based on player-related information;
• select an item from the items that belong to the lottery range by performing the lottery process;
• and
• perform an item acquisition process that allows a player to acquire the selected item.

A computer-implemented method comprising:

• performing, by a hardware processor or an application-specific integrated circuit (ASIC), a game process;
• setting, by the hardware processor or the ASIC, a lottery range of a lottery process, the lottery range of the lottery process specifying a range of items among a plurality of items used during the game process that are subjected to the lottery process, wherein the plurality of items are stored in a memory in a data structure in which the plurality of items are linked so as to have one or more parent-child type relationships, and the lottery range is set so that a child item is included within the lottery range of the lottery process when a parent item has been set to an acquired state or an acquirable state;
• changing, by the hardware processor or the ASIC, the lottery range of the lottery process based on player-related information;
• selecting, by performing the lottery process by the processor or the ASIC, an item from the items that belong to the lottery range of the lottery process;
• and
• performing, by the hardware processor or the ASIC, an item acquisition process that allows a player to acquire the selected item.

A non-transitory computer-readable information storage medium storing a program that, when executed by a computer, causes the computer to:

• perform a game process;
• set a lottery range of a lottery process, the lottery range of the lottery process specifying a range of items among a plurality of items used during the game process that are subjected to the lottery process, wherein the plurality of items are stored in a memory in a data structure in which the plurality of items are linked so as to have one or more parent-child type relationships, and the lottery range is set so that a child item is included within the lottery range of the lottery process when a parent item has been set to an acquired state or an acquirable state;
• change the lottery range of the lottery process based on player-related information;
• select, by performing the lottery process, an item from the items that belong to the lottery range of the lottery process;
• and
• perform an item acquisition process that allows a player to acquire the selected item.