i ended up looking it up and found the answer, i still dont understand the maths behind it though. but this guy 'steelhead96' on youtube got the answer somehow. it looks like hes played through the whole thing too!! i wont spoil what the password is though but its early in his video for the true ending <3
Viewing post in Lucky Rabbit Club ENDINGS GUIDE! (SPOILERS) comments
Took a little looking around since I've never played darts before. The numbers on each slice of the board are the base score, and the location for each ticker shows you how much to multiply it by. Once on white or gray, twice on the outer circle, and three times on the inner circle. You have to add Maggie and the other friends scores. Maggie's are marked by the actual darts... That tripped me up at first. Should be the same every time, though.