Clear any medium or bigger puzzle without having to delete any lines.
Check out the credits screen.
You cleared all chapter 1 puzzles!
Clear 10 puzzles in total.
Clear your very 1st puzzle ever!
Check the toturial.
You cleared all chapter 2 puzzles!
You cleared all chapter 3 puzzles!
You cleared all chapter 4 puzzles!
You cleared all chapter 5 puzzles!
Clear 50 puzzles in total.
Clear 100 puzzles in total.
Clear 250 puzzles in total.
Clear all puzzles in the "Vehicles" puzzle pack.
Clear a humongous 128x128 sized puzzle.
Clear a humongous 128x128 sized puzzle and then RESET it!
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