The arcade idea is worth stealing for a party, and the part worth stealing is not the machines. It is that everyone gets a score, and a score is not a defeat.
Party games that knock children out produce a room of bored spectators by the third round, and the smallest child goes first. Arcade scoring solves it exactly: everyone plays every round, everyone gets a number, and the number is the fun.
A big sheet where every name gets written up after each round is the thing that makes it an arcade rather than a set of games. Children will play the same beanbag toss six times to move a number, and they cannot be persuaded to play it twice without one.
Move the line. A four-year-old throws from closer than an eight-year-old and nobody minds — everyone can see that the distances are different and that it is deliberate.
Small if at all, and give something to everyone. The leaderboard is already doing the motivating; a big prize turns it into a contest and produces a crying child.
Three, played twice, beats six played once. Repetition is what makes a score mean anything.
Part of our guide to Retro arcade party.