Puzzles can be satisfying, but for them to be effective in enhancing the feeling of agency, they should not require a further suspension of disbelief. A game should work within the logic and rules that it's already established - such as Myst's elevator puzzle, in which it would be somewhat reasonable to have a hidden entrance; conversely, The Seventh Guest's cake puzzle is unrealistic as there is no reason to cut a cake past the game instructing the player to do so. Thus, the player feels as if they have effectively more agency in Myst than The Seventh Guest.