Server device, control method performed by the server device, program, and terminal device

1. A control method performed by a server device, the server device connected via a network to a terminal device configured to communicate with the server device and configured to implement a lottery system for enhancing interest of a user in a game, the method comprising:

storing, in a storage unit, a plurality of lottery modes, wherein each of the plurality of lottery modes associates respective items, which are providable to the user, with item odds;

receiving a start request for a game from the terminal device;

selecting, with a mode selecting unit, a lottery mode from among the plurality of lottery modes, and storing mode information for the lottery mode in a user information table of a user associated with the terminal device;

receiving a mode selection request, on the mode selecting unit, from the terminal device, the mode selection request including one of a release command or a continue command, and determining, with the mode selecting unit, whether the mode selection request includes the release command or whether the mode selection request includes the continue command;

when the continue command is received, retaining the mode information of the lottery mode in the user information table;

when the release command is received, changing the selected lottery mode to another lottery mode from among the plurality of lottery modes such that the another lottery mode becomes the selected lottery mode, and updating the mode information stored in the user information table;

holding a drawing from among a plurality of types of the items on the basis of the selected lottery mode; and

when the continue command was received, maintaining the mode information in the user information table and performing, in response to a subsequent request for the game from the terminal device, the game according to the selected lottery mode without a further step of selecting the lottery mode from among the plurality of lottery modes.

2. The control method according to claim 1 , wherein the another lottery mode is a first mode configured to be provided in a default state.

3. The control method according to claim 1 , wherein the selected lottery mode is associated with at least one instance of changed item odds as compared to the another lottery mode.

4. The control method according to claim 3 , wherein retaining the mode information of the lottery mode comprises retaining a stored table of item odds comprising the at least one instance of changed item odds; and

wherein performing, in response to the subsequent request for the game from the terminal device, the game according to the selected lottery mode comprises maintaining the stored table of item odds including the at least one instance of changed item odds.

5. The control method according to claim 4 , wherein, when the release command is received, the control method further comprises resetting the stored table of item odds, wherein resetting the stored table of item odds comprises changing the at least one instance of changed item odds to a normal value different from the at least one instance of changed item odds.

6. The control method according to claim 3 , wherein the selected lottery mode is a second mode, and wherein the at least one instance of changed item odds comprises a reduction in item odds for at least one item already owned by the user.

7. The control method according to claim 6 , wherein the reduction in item odds for the at least one item already owned by the user comprises setting item odds associated with the at least one item already owned by the user to zero.

8. The control method according to claim 3 , wherein the selected lottery mode is a third mode, and wherein the at least one instance of changed item odds comprises an increase in item odds associated with a set of items having a common item parameter.

9. The control method according to claim 8 , wherein the increase in item odds associated with the set of items having the common item parameter comprises setting item odds associated with the set of items having the common item parameter to 100%.

10. The control method according to claim 9 , wherein the common item parameter is selected from one of: an attribute or a skill;

wherein, in a case where the common item parameter is the attribute, the attribute is common to the set of items, and the game is configured to provide an adjustment to at least one interaction between items based on the attribute, and

wherein, in a case where the common item parameter is the skill, the skill is common to the set of items, and the game is configured to enable at least one action to be executed within the game by use of the skill.

11. The control method according to claim 3 , wherein the selected lottery mode is a fourth mode, and wherein the at least one instance of changed item odds comprises an increase in item odds associated with a specific item among the plurality of types of the items.

12. The control method according to claim 11 , wherein the specific item among the plurality of types of the items is one of: a newly-added item having been added to the game more recently than a remainder of the plurality of types of the items, and a skill-having item configured to enable at least one action to be executed within the game by use of a skill associated with the skill-having item.

13. The control method according to claim 1 , wherein, prior to a step of receiving the mode selection request from the terminal device, the control method comprises causing the terminal device to display a user interface comprising a continue element configured to trigger the continue command and a release element configured to trigger the release command.

14. The control method according to claim 13 , wherein the user interface further comprises an image representing the selected lottery mode.

15. The control method according to claim 13 , wherein, following the step of receiving the mode selection request from the terminal device, when the mode selection request comprises the release command, the control method comprises causing the terminal device to display a user interface corresponding to the another lottery mode.

16. The control method according to claim 15 , wherein the another lottery mode is a first mode, wherein the user interface corresponding to the another lottery mode is a lottery start screen, and wherein the control method further comprises causing the terminal device to display the lottery start screen prior to receiving the start request for the game from the terminal device.

17. The control method according to claim 1 , wherein selecting the lottery mode from among the plurality of lottery modes further comprises storing the mode information of the lottery mode in a memory of the server device.

18. The control method according to claim 17 , wherein changing the selected lottery mode to the another lottery mode from among the plurality of lottery modes further comprises deleting the mode information of the lottery mode from the memory of the server device.

19. A server that is communicatively linked to a terminal device via a network and configured to implement a lottery system for enhancing interest of a user in a game, wherein the server is configured to carry out steps comprising:

storing, in a storage unit of the server, a plurality of lottery modes, wherein each of the plurality of lottery modes associates respective items, which are providable to the user, with item odds;

receiving a start request for a game from the terminal device;

selecting, with a mode selecting unit of the server, a lottery mode from among the plurality of lottery modes, and storing mode information for the lottery mode in a user information table of a user associated with the terminal device;

receiving a mode selection request, on the mode selecting unit, from the terminal device, the mode selection request comprising one of a release command or a continue command, and determining, with the mode selecting unit, whether the mode selection request includes the release command or whether the mode selection request includes the continue command;

when the continue command is received, retaining the mode information of the lottery mode in the user information table;

when the release command is received, changing the selected lottery mode to another lottery mode from among the plurality of lottery modes such that the another lottery mode becomes the selected lottery mode, and updating the mode information stored in the user information table;

holding a drawing from among a plurality of types of the items on the basis of the selected lottery mode; and

when the continue command was received, maintaining the mode information in the user information table and performing, in response to a subsequent request for the game from the terminal device, the game according to the selected lottery mode without a further step of selecting the lottery mode from among the plurality of lottery modes.

20. A non-transitory computer-readable storage medium having recorded therein a process for causing a computer to perform steps comprising implementing a lottery system for enhancing interest of a user in a game, the steps comprising:

storing, in a storage unit of the computer, a plurality of lottery modes, wherein each of the plurality of lottery modes associates respective items, which are providable to the user, with item odds;

receiving a start request for a game from a terminal device;

selecting, with a mode selecting unit, a lottery mode from among the plurality of lottery modes, and storing mode information for the lottery mode in a user information table of a user associated with the terminal device;

receiving a mode selection request, on the mode selecting unit, from the terminal device, the mode selection request comprising one of a release command or a continue command, and determining, with the mode selecting unit, whether the mode selection request includes the release command or whether the mode selection request includes the continue command;

when the continue command is received, retaining the mode information of the lottery mode in the user information table;

when the release command is received, changing the selected lottery mode to another lottery mode from among the plurality of lottery modes such that the another lottery mode becomes the selected lottery mode, and updating the mode information stored in the user information table;

holding a drawing from among a plurality of types of the items on the basis of the selected lottery mode; and

when the continue command was received, maintaining the mode information in the user information table and performing, in response to a subsequent request for the game from the terminal device, the game according to the selected lottery mode without a further step of selecting the lottery mode from among the plurality of lottery modes.