public void nextLevel() {
		if (level < MAX_LEVEL) {
			level++;
			generateRandomCode(level);
			for (int i = 0; i < 4; i++) {
				System.out.print(code[i]);
			}
			System.out.println();
		} else {
			resetLevel();
			//JOptionPane.showMessageDialog(null,
				//	"You've successfully broken into the bank!",
				//	"Congratulations!", JOptionPane.OK_OPTION);
		}

		// Checks if the difficulty will increase depending on the level
		if (level == 4 || level == 5) {
			numOfChoices = MORE_DIFFICULT;
		}

	}