Necrotic's finely balanced fortress demonstrates the relative masses of different materials. A single small stone can be enough to upset the whole pile.
A bomb or three should bump off the four leftmost castle-dwellers in TROJANS's creation, but penetrating through to the knights on the right is tricky.
SynicGames's castle is a deceptive beast. You can flatten the outer shell easily, but that inner sanctum is a tough nut to crack.
Strip away the wooden bits and Frankfart's stronghold is unassailable - or is it? Try knocking the stone lookout tower onto the rightmost metal rooms.
IWazBord's castle is a grinning metal giant. Come to the aid of the soldiers as they try to liberate the King and Queen from the titan's belly.
You could knock LordSH's level flat with a single shot, but a neater way to do it might be to catapult the King on the left into his own keep .
As spindly as it might seem, monich123's level is startlingly hard to topple. Getting to the monarch at bottom is the challenging bit.
RKO's stronghold is another instant gratification affair, despite its iron construction. One well-aimed bomb should be all it takes.
Sguos's nightmarish pyramid, on the other hand, stands up to one hell of a beating. If you can do it in under 100 shots, we'll eat our hats.
But toughest of all by far is 00Formula's citadel. We couldn't even get one of the triangular roof bits to fall off.