if (currentStage.hasWon()) // this stage win
				{
					this.rows++;
					this.cols++;
					this.nextStage();
				} else if (currentStage.hasLose()) // this stage lose
				{
					this.lives--;
					int round = 0;
					while (round < 5) {
						currentStage.robotSummonAnimationFrame();
						Thread.sleep(100);
						round++;
					}
					this.remove(currentStage);
					this.rows--;
					this.cols--;
					if (lives > 0)
						this.nextStage(); // if there is still another stage
				} else if (!currentStage.isTimeUp()) {
					currentStage.timeRunning();
				}
				if (lives < 0) {
					this.gameOver();
				}
				this.repaint();
				Thread.sleep(100);