Meerca Chase Tips!
::j.boogie!:: Click the top right corner of the screen when selecting difficulty. A message reading "::j.boogie::" should appear. This doesn't do anything. It's just a joke because clicking that place used to unlock a secret level.
Tip: Play in Hard mode for a few rounds, but don't send your score unless it is your absolute best. After playing on Hard mode for a minutes, play on Easy mode. Since you're used to Hard mode, Easy mode will seem very easy!