I start my summer camps on Saturday, so I won't be on the site untill the end of July or mid-August. Then I wish you good holidays, and I let Pikachu says you "Goodbye" :)

Difficulty : *****

Tested, logical.
Edge-logic can be usefull, especially with the 7 from C21, the 5 from C22, the 4 from C23, the 3 from R4...
You can also notice that the 2 from C23 has an influence on the 2 from C22.
Good blackenage.