I came up the wave idea which has a very very large amount of bombs, to make them explode like a Domino effect.
So i use GD to build this, for wave concept (C blocks are chickens, ofc)
There will be 10 times, 10 bombs and a random chicken each, covered up with barriers (one side can be destroyed, to let the bombs explode, and disappear when all bombs in a sector is exploded)