Space curvature
A grid pattern that becomes distorted and seems to flutter...
Difficulty : ******
Tested, logical.
Don't require any specific method, but you'll need to be very, very focused. Column C7 can be a good key.
Good blackenage.
Puis, les colonnes C5, C12, C23 et les lignes L6, L8, L11, L21, L24 offrent un bon quadrillage.
Je rappelle également que C7 sera une bonne clef.
Bon courage ;)
Bravo
Pierre