Accompanying the custom party sizes new to v1.04 are leaderboards for tracking high scores from games played on Novice, Medium, Expert & Master with non-standard parties :)
Playing as a solo, duet or trio of hero pieces represents a fresh challenge and everyone's best performances deserve a bit of fame! The new leaderboards are super empty so now's a great time to get your name on top :D
All pre-existing high scores remain and are viewable on the "quartet" page for each difficulty. Also, the inner workings driving leaderboard score submission and retrieval have been retooled considerably for better performance. Flipping through pages of the leaderboards should no longer cause game crashes nor should your scores ever be lost at the end of Endless runs by freak Steam connection drops.
If you happen to notice anything weird with the leaderboards, please share it on the forums! http://steamcommunity.com/app/415910/discussions