Valiant Hearts features a Hint system that can be triggered in the middle of puzzles, using the F1 (PC) / Select (PS3) / Back (X360) / View (XB1) / Front Touch Buttons (PS4).
The following icon will regularly pop-up on screen to notify you that Clues are available to pass the current puzzle.

Up to 3 clues are available, giving you all the information necessary to proceed - all 3 clues can be viewed almost straight away.
The following icon will regularly pop-up on screen to notify you that Clues are available to pass the current puzzle.
Up to 3 clues are available, giving you all the information necessary to proceed - all 3 clues can be viewed almost straight away.