Hi, sorry for the delayed answer.

Ok let's say the number are 12 and 15. You need to put them together like this : 1215. Then you can multiply this.
I know the wording is a bit weird, I didn't knew how to express this concept clearly. English is not my main language.

Anyway, thanks for the interest in the game ! Good luck !

Can you be more specific ? You can't open the main zip file ?

Thanks ! I'ill check it out.

Thanks a lot for your comment !

It's short for "password".

The french text is a famous french song, it's on purpose in french since you don't have to understand it in order to complete the puzzles.

(Thanks for your comment by the way !)