public static int BuildStageId(AreaTypeId areaTypeId, RegionTypeId regionTypeId, DifficultyId difficultyId, int number) => default;
public bool CheckDifficultyId(DifficultyId difficultyId) => default;
public int GetStarsInAreaByDifficulty(AreaTypeId areaTypeId, DifficultyId difficultyId) => default;
public static UserPrize AssertCanCollectStoryStarsReward(this UserStageData data, DifficultyId difficultyId, int stars) => default;