ActorManager.Instance C# (CSharp) Method

    public static ActorManager Instance() {
        return instance;
    }

        public void Update(GameTime gameTime)
        {
            var    s   = GameDevice.Instance().GetSound();
            string bgm = mIsClear ? "clear" : "tekuteku_arukou";

            s.PlayBGM(bgm);

            FadeUpdate(gameTime);
            if (mFadeState == FadeState.OUT)
            {
                return;
            }

            if (Input.GetKeyTrigger(Keys.Q))
            {
                if (mIsClear)
                {
                    return;
                }
                string se = mIsMenu ? "menu_close" : "menu";
                mIsMenu  = !mIsMenu;
                mMenuNum = 0;
                s.PlaySE(se);
            }

            if (!mIsMenu)
            {
                if (mIsClear)
                {
                    mAnim.Update(gameTime);
                    mAnim.SetMotion(0);
                    if (Input.GetKeyTrigger(Keys.Space) || Input.GetKeyTrigger(Keys.Enter))
                    {
                        mNextScene = Scene.StageSelect;
                        SetFadeState(FadeState.OUT);
                        s.PlaySE("stage_choice");
                    }
                    return;
                }

                if (Input.GetKeyUp(Keys.X))
                {
                    mStage.Reset();
                    s.PlaySE("reset");
                }
                if (ActorManager.Instance().IsClear())
                {
                    mIsClear = true;
                    s.StopBGM();
                    if (ActorMove.mWalkCount <= mRankA)
                    {
                        mA = 0;
                    }
                    else if (mRankA < ActorMove.mWalkCount && ActorMove.mWalkCount <= mRankB)
                    {
                        mA = 3;
                    }
                    else
                    {
                        mA = 6;
                    }

                    if (ActorMove.mWalkCount < mRecord)
                    {
                        FileManager.WriteRank("./Content/data/rankData.txt", mStageNo, mRecord);
                        mRecord = ActorMove.mWalkCount;
                    }
                }
                ActorManager.Instance().Update(gameTime);
            }
            else
            {
                mAnim.Update(gameTime);
                mAnim.SetMotion(0);

                if (Input.GetKeyTrigger(Keys.Up))
                {
                    mMenuNum--;
                    s.PlaySE("cursor");
                }
                if (Input.GetKeyTrigger(Keys.Down))
                {
                    mMenuNum++;
                    s.PlaySE("cursor");
                }
                mMenuNum = (mMenuNum + 4) % 4;

                if (Input.GetKeyTrigger(Keys.Space) || Input.GetKeyTrigger(Keys.Enter))
                {
                    string se = "stage_choice";
                    switch (mMenuNum)
                    {
                    case 0:
                        mNextScene = Scene.Title;
                        SetFadeState(FadeState.OUT);
                        break;

                    case 1:
                        mNextScene = Scene.StageSelect;
                        SetFadeState(FadeState.OUT);
                        break;

                    case 2:
                        mIsMenu = false;
                        se      = "menu_close";
                        break;

                    case 3:
                        Game1.mIsEndGame = true;
                        break;
                    }
                    s.PlaySE(se);
                }
            }
        }