public void removeRow(int startRow) {
		for (int col = 0; col < getWidth(); col++) {
			board[startRow][col] = 0;
		}
		for (int row = startRow - 1; row >= 0; row--) {
			for (int col = 0; col < getWidth(); col++) {
				if (row == 0) { // the most highest rows
					board[row][col] = 0;
				} else {
					board[row + 1][col] = board[row][col];
					board[row][col] = 0;
				}
			}
		}
	}