We played a game four times and got the score as -1, -4, -8, and 10.
To get the final score, we should add all results of all the games together.
Final Score = First game result + Second game result + Third game result + Fourth game result.
Final score = (-1) + (-4) + (-8) + (10)
Final Score = (-13) + (10)
Final Score = -3
Hence, the overall score of all the games would be -3.