Clash-of-clans – Remove high level savegame

Well.. rarely do you get a more definitive answer than from the developers themselves:

How does the Wall Breaker choose its target?
Steps 1, 2, 3
1. It will look for the nearest building/turret that is trapped (fully or partially) by walls
2. It will choose the shortest path towards that building and blow up walls that are in its way
3. After the wall is blown up, it will choose the next building that is still trapped by walls, run straight towards it, and blow up walls that are in its way

So Wall Breakers don’t target walls anymore?!?!!1!!!!?
No. Instead of targeting walls, they aim for the main prize, a building that is trapped by walls. The wall just happens to be in its way, and has to be blown up. That building is the reason why you need that wall taken down, right?

Do Wall Breakers attack buildings?
No. They aim for the building and blow up the wall that is in their path.

Do Wall Breakers favorite junctions?
No. The Wall Breaker will run in a straight line towards the nearest building. When it encounters a wall, it blows it up.

Can I fool Wall Breakers by using spikes or short decoy wall sections?
No. They won't be fooled by those.

The two main takeaways from this that are interesting:
1. You can no longer lure Wall Breakers with "vestigial" walls.
2. Wall Breakers target the nearest enclosed building. Some have found that you can confuse them near the edge of your main village by enclosing something like a builder hut or tesla. ¡Viva the AI abuse!

Edit:

As added info, I've found this video from Flammy extremely informative. He shows the Wall Breaker aggro in action, and even has some crude measurements of aggro distance.

You aren't alone with these problems. A thread here explains it, but here is the solution:

The quote you replied to had an individual who was playing one game locally, signed onto a new device with gamecenter, and basically attached the brand new game to his gamecenter.

So you are left with an old iPhone with your locally played "Good" game, and a new iPhone with a brand new village attached to gamecenter?

You can only have one village attached to gamecenter at a time. If the above is right, then you have 2 options. Create a new gamecenter account and attach it to the good game, or if you want to keep the game on your old gamecenter, there will be extra steps. Either way, you still need to have network capabilities on the old iPhone.

To re-use the old gamecenter currently attached to the new game:

Create brand new gamecenter account Close CoC and log out of gamecenter on the new iPhone. Log into the new iPHone with the brand new gamecenter you just created. Launch CoC, when prompted to save that village to this new GC, accept. Close CoC, launch it from within the gamecenter app itself, play it for a few minutes, then...

This will have severed the old gamecenter to new village connection.

Go back on the old iPhone and make sure you are logged in with that old gamecenter and launch CoC (good village). This should prompt you to attach that village to the old gamecenter. Same thing, close, launch through gamecenter, play it a few minutes, etc. Close CoC

Next step would be to make sure CoC is closed (force quit it) and you log out of that new gamecenter on the new iPhone. Then log in with the old gamecenter and launch CoC, which will bring the good game over to the new device.

I know when I attached my second iOS device to my gamecenter and launched CoC, it asked me if I wanted to link the village attached to the gamecenter account to this phone. It will start to walk you through the tutorial, but just go through it until you are on your own, login to gamecenter and then accept the popup from CoC.