Abstract: A game management server device includes an evolution processing management unit that evolves base game media into evolved game media by combining them with partner game media in accordance with an evolution material table that includes settings for the base game media, partner game media, evolved game media, and evolution success probabilities, and a player information storage unit that stores, for each player, information on the base game media, partner game media, and the evolution material table belonging to the player, and, the evolution processing management unit, upon receiving instructions to evolve the base game media evolution from the player and for said player owning an evolution material table used for evolving the base game media, as well as the base game media and partner game media configured in said evolution material table, uses the evolution success probabilities configured in said evolution material table to make a determination.

Abstract: A game providing system according to an embodiment of the present invention includes one or more processors capable of executing a game program. In one embodiment, the game program includes a conversion rate presentation module configured to present a conversion rate between a first basic point and a first varying point to a player. When a first basic object associated with the first basic point is selected, an acquired point of the player is determined on the basis of the first basic point. When a first varying object associated with the first varying point is selected, the acquired point is determined on the basis of the first varying point.

Abstract: A game providing system according to an embodiment of the present invention includes one or more processors capable of executing a game program. In one embodiment, the game program includes a conversion rate presentation module configured to present a conversion rate between a first basic point and a first varying point to a player. When a first basic object associated with the first basic point is selected, an acquired point of the player is determined on the basis of the first basic point. When a first varying object associated with the first varying point is selected, the acquired point is determined on the basis of the first varying point.

Abstract: A server device includes the following elements. A random selection section randomly selects a game content having a certain attribute on the basis of a predetermined winning probability. A progress processor progresses a game and calculates a progress rate of the game on the basis of a predetermined parameter. A winning probability changing processor changes, according to the attribute and a progress rate of the game calculated at a certain time point, winning probabilities of game contents after the lapse of a predetermined period from the certain time point, and sets, according to the attribute, an interval at which the winning probabilities of the game contents are changed and also sets attributes so that the attribute for which the winning probability of a corresponding game content is changed will periodically vary. A providing section provides a selected game content to the game player.