public static bool CheckCustom(string formula)
    {
        if (formula == "high_prio")
            return true;

        else if (formula == "story_ch3_aya_hired")
        {
            foreach (data_girls.girls Girl in data_girls.girl)
            {
                if (Girl.Type == data_girls.girls._type.aya && Girl.status != data_girls._status.graduated)
                    return true;
            }

            return false;
        }

        // GAME OVER: BANKRUPTCY

        else if (formula == "bankruptcy_high_rel")
        {
            if (Bankruptcy.Best_Relationship_Girl == null)
                return false;

            return Bankruptcy.Best_Relationship_Girl.GetRelationshipLevel(Relationships_Player._type.Friendship) >= 4;
        }

        else if (formula == "bankruptcy_med_rel")
        {
            if (Bankruptcy.Best_Relationship_Girl == null)
                return false;

            return Bankruptcy.Best_Relationship_Girl.GetRelationshipLevel(Relationships_Player._type.Friendship) >= 2;
        }

        // GAME OVER: SCANDAL

        else if (formula == "scandal_multiple_left")
        {
            return tasks.Story_Data.scandal_idols_left > 1;
        }

        // SUBSTORIES

        else if (formula == "took_loans_fujimoto")
        {
            foreach (loans._loan Loan in loans.Loans)
            {
                if (Loan.Type == loans._loan._type.fujimoto)
                    return true;
            }

            return false;
        }

        else if (formula == "took_loans_bank")
        {
            foreach (loans._loan Loan in loans.Loans)
            {
                if (Loan.Type == loans._loan._type.bank)
                    return true;
            }

            return false;
        }

        else if (formula == "5_perf_in_week")
        {
            if (Stats.CountActivities(Activity._type.performance, 10) >= 5)
                return true;

            return false;
        }

        else if (formula == "hoarse_spa")
        {
            if (Stats.CountActivities(Activity._type.spa_treatment, 4) >= 1)
                return true;

            return false;
        }

        else if (formula == "hoarse_no_perf")
        {
            if (Stats.CountActivities(Activity._type.performance, 3) == 0)
                return true;

            return false;
        }

        else if (formula == "has_breakroom")
        {
            var Rooms = agency.GetRooms();

            foreach(var Room in Rooms)
            {
                if (Room != null && Room.type == agency._type.recreation_room)
                    return true;
            }

            return false;
        }

        else if (formula == "overworked_check")
        {
            if (Stats.CountActivities(Activity._type.performance, 5) == 0)
                return false;

            var girls = data_girls.GetActiveGirls();

            int count = 0;

            foreach(var girl in girls)
            {
                if (girl.GetPhysicalStamina() < 20)
                    count++;
            }

            if (count >= 2)
                return true;

            return false;
        }

        // RANDOM EVENTS

        else if (formula == "single_in_dev")
        {
            foreach(var Single in singles.Singles)
            {
                if (Single.status == singles._single._status.normal || Single.status == singles._single._status.working)
                    return true;
            }

            return false;
        }

        return false;
    }