A list of suggestions for leaderboards that I think would be neat, mainly using currently existing stats displayed in the collection book.
Plaza
- Most splash screen cat pets
- Most Units spent at stores
- Most jumps jumped
- Most steps stepped
Condo
- Most items placed
- Most catsacks opened (all types)
- Most condos visited
- Most addicted to TV
Minigames
- Top high score (one for each minigame)
Fishing
- Most fish caught
- Most trash caught
Casino
- Most nothings on Wheel of Money
- Most jackpots
Typing Derby
- Most words typed
- Fastest race finish time
- Highest combo
Accelerate
- Most races won
- Most players hit
- Most damaged by items
- Longest total drift time
Zombie Massacre
- Best score
- Most days survived