Every account scores five mashups a day, free or not, and a mashup's score is the average of its two drivers' power. These are the boards as they stand — the week, month and year are the days in them added up. Draw a mashup to join one, or see the frozen results in the Hall of Fame.
A ladder day is a UTC day, so it turns at midnight UTC rather than at your local midnight; a week starts on Monday UTC and a month on the 1st. Ties go to the higher single mashup, then to whoever got there first. The average is points divided by scored mashups in the period, so a total that grew from drawing every day can be told from one that grew from a hot streak. A period is frozen on total points, so the average is a way to read the board, never a second one a winner could come from. Names are display names only — the address behind an account is never shown — and a deleted account's rows go with it.