In single-player mode, everything seems to work normally. The player's score starts at 000000 just as you would expect. But when you hit the credit button again for a 2-player game, the machine activates player 2, but also gives Player 1 some free points automatically before the first ball is even plunged. The amount added to player 1's score seems to be random, and a relatively small number, like 6060 or 15010. All other aspects of the scoring seem to be fine.