Spent 60 seconds or more in a level
Completed level 12
Spent 30 seconds or more in a level
Completed level 10
Completed a level containing 4 books
Completed level 8
Took 175 steps in total
Took 150 steps in total
Pushed books 5 times
Used undo 5 times in total
Completed level 2
Completed a level without using restart
Completed a level without using undo
Completed 2 levels without using undo
Completed level 6
Took 100 steps in total
Completed a level containing 3 books
Took 50 steps in total
Completed level 4
Pushed books 10 times
Pushed books 15 times
Pushed books 20 times
Pushed books 25 times
Used undo for the first time
Restarted a level for the first time
