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(print: $grille01) (if: $grille01 < 2)[The grid is rusty, so much so that you'll have to push it. (set: $grille01 to it + 1)Do you want to [[push the grid|Grille01]] ou [[stop the game|Abandon]] ?] (else:)[Zut]
Comments
The output of a header tagged passage is appended to the start of the output of the current Passage content being shown, and each time passage traversal occurs the current passage's output is deleted from the page so that the output of the next Passage can be inserted in its place. This results in the header (and footer) output also being deleted, which means the related content needs to be executed again.
Because the $grille01 variable was being set to zero in the header passage, which was being executed each time a passage was displayed, by the time the (if:) macro was evaluated it would be always be zero.
To solver this issue the initialisation of the $grille01 variable needs to occur in a passage that gets executed some time before the Grille01 passage is shown, an idea place to do that initialisation is within your story's startup tagged passage.
note: This would of also been an issue if using Harlowe 2.x and the solution would of been the same as well.