I have limited access as I'm a newbie here
.
But finally I could solve my problem : there is a set of logic gates and it must think in terms of logic of digital electronics. I took into account (thanks to Claudius) that:
==>
1/ To compare 2 bits, we can use an OR exclusive with 2 inputs and 1 output
==>
2/ To compare 2 numbers made with several bits, an OR is used on all the outputs of each OR Exclusive which is applied to all the bits of the same level.
The problem is that there was not enough space to put all the elements :one tile per module (but I cannot put the picture as I have not the privilege yet. If you need, let me know I will share separately)
Then I saw that there is an option which makes it possible to have others modules, in particular the comparator of 2 bits.
And that simplifies everything: the 2-bit comparator avoids having to build our exclusive OR with several logic gates. Then I fund the solution (still cannot share the pictures
).
Finally I think the game is instructive and allows you to understand how logic gates work. I enjoy playing this game, it makes you think and my goal is to finish it. I will probably still need your advice
, if I'm blocked.
Take care !
____________________________
Vik
. The concept is to solve problem room after room : the level increase progressively. It is totaly free, you can tell me what you think ;-) 
