Your comment helped me, I wondered why it didn't work for 20 and came to read the comments to see if there was a problem with the test cases, but no it was my own code. Rounding errors on rows 11 and 15.

I agree, it should specify whether it was sorted or not - I did it assuming the input array was unsorted.

Thanks for this Kata, I don't remember seeing Karnaugh Maps before, so I learnt something new and useful! :)

One minor suggestion for the language:
"You have just finished to assemble the time-bomb"
should probably read:
"You have just finished assembling the time-bomb"

It should really be pascals_triangle rather than pascalsTriangle for Ruby style :)

This one certainly made me think. My first attempt failed on level 20 due to rounding errors, so I re-wrote it in a different way.