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Achievements
Complete each achievement to get the allotted gamerscore:
Solved World 2 (15) - Fit together all the world #2 puzzle pieces and align the puzzle in its frame.
Solved World 3 (15) - Fit together all the world #3 puzzle pieces and align the puzzle in its frame.
Solved World 4 (15) - Fit together all the world #4 puzzle pieces and align the puzzle in its frame.
Solved World 5 (15) - Fit together all the world #5 puzzle pieces and align the puzzle in its frame.
Solved World 6 (15) - Fit together all the world #6 puzzle pieces and align the puzzle in its frame.
Traversed World 2 (10) - Travel all the way across World #2.
Traversed World 3 (10) - Travel all the way across World #3.
Traversed World 4 (10) - Travel all the way across World #4.
Traversed World 5 (10) - Travel all the way across World #5.
Traversed World 6 (10) - Travel all the way across World #6.
Speed Run (15) - Complete a full speed run of the entire game, beating the challenge time.
Closure (60) - Complete the game.
Unlock Final Star / Secret Ending
If you collect all 7 secret stars throughout the game, the 8th and final star will appear in the last level and some of the switches in the level will become immune to time manipulation, allowing you to reach the star as well as changing the outcome of the chase.
Unlock World 1 and the Epilogue
There is a broken ladder that leads to the attic in the house at the level select area. To repair this ladder, you must find all 72 puzzle pieces and assemble each world's jigsaw puzzle. Once this is done, you may climb up and enter the door to World 1. After beating World 1, you will be taken directly to the Epilogue, which you can return to at any time after its completion by walking left from the title screen, into an offscreen alcove.
Hidden Book in Epilogue
In the second-to-last room in the Epilogue (Just before the Castle), jump from the elevated platform onto the center of the bridge / middle of the rock. A sound will play and a new journal entry will appear.
Hidden Texts in Epilogue
Aside from the last, each room in the Epilogue has at least one object that you can stand behind. If you have the red book on that screen open and the text of it is displayed in the air, standing behind these objects in the proper location will cause a sound to play and the text to change, revealing more information. If you open a green book, the red book will close and the text will disappear, so you will need to use time manipulation to see all 4 of these secret writings.