I have stats on the old game Layer Spleef. I don't think there are any records for this, so these could be the starting records: Most wins, most games played, most power ups picked up, most blocks broke, most blocks walked, most layers played on, and most eggs shot. Most time played could also be a record but in the screenshot it is obviously very glitched.
Oh just realized layer spleef was posted oops
But I have another record which is kinda random. When trophies where a thing for mini games like layer spleef, wing rush, and line dash, I was thinking there could be a nostalgic record for most trophies won in a single set of games. Here is the evidence of me getting 31:
Finally just one more idea for a record is most achievements won in a single game. (This could be any game mode) This screenshot shows me getting 3 achievements after one Skywars game