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