Server apparatus and a game system

PROBLEM TO BE SOLVED: To vitalize a specific game.SOLUTION: A server device 12 includes: acquisition means 120 for acquiring achievement information including an achievement that is granted by check-in processing at a store to a game terminal 10 to which a plurality of games are provided, and identification information of a specific game from among the plurality of games; individual conversion means 122 for referring to individual converted values 122 set for each game, and for converting the achievement included in the achievement information acquired by the acquisition means 120 into rewards usable for the specific game, based on the individual converted value 122 corresponding to the identification information acquired by the acquisition means 120 from among the referenced individual converted values 122; and instruction means 124 for instructing granting of the reward converted by the individual conversion means 122.SELECTED DRAWING: Figure 3