Collect 20 stars to unlock the second level.
Collect 100 stars to unlock the third level.
Collect 500 stars to unlock the last level.
Solve a level 1 puzzle without erasing even once.
Get 4 stars on a yet unplayed puzzle in level 1 with the zero tolerance mode activated.
Get 4 stars on yet unplayed puzzles 4 times in a row at level 1.
Solve 80 level 1 puzzles.
Collect 1000 stars.
Get 4 stars on a yet unplayed puzzle in level 2 with the zero tolerance mode activated.
Get 4 stars on a yet unplayed puzzle in level 3 with the zero tolerance mode activated.
Get 4 stars on a yet unplayed puzzle in level 4 with the zero tolerance mode activated.
Solve all 80 level 3 puzzles.
Solve all 80 level 2 puzzles.
Solve all 80 level 4 puzzles.
Solve a level 2 puzzle without erasing even once.
Solve a level 4 puzzle without erasing even once.
Solve a level 3 puzzle without erasing even once.
Get 4 stars on new puzzles 4 times in a row at level 2.
Get 4 stars on new puzzles 4 times in a row at level 3.
Solve a yet unsolved level 1 puzzle for in less than 25 seconds
Get 4 stars on new puzzles 4 times in a row at level 4.
Solve a yet unsolved level 2 puzzle for in less than 50 seconds
Solve a yet unsolved level 3 puzzle for in less than 4 minutes.
Solve at least 4 new puzzles in challenge mode per each level.
Solve a yet unsolved level 4 puzzle for in less than 5 minutes.