There is six levels on Region 11 that you will need to get Gold medals on. These levels are some of the hardest in the game excluding 11-2. Here are some tips to help you achieve gold on each. Note that, this is how I did it, so although it worked for me, it may not be the best solution.
First shot - Aim at the middle score token at about half power. Try to guide it into the hot goblin by curving left while aiming for the middle of the archway at the bottom. When the bomb shot was in the middle of the archway detonate it and collapse the entire archway and hopefully some of the surrounding castle.
Second shot - Aim at the score token on the left at about half power. Curve the shot to the right to line up the speed shot with the entire left wall. Take out the entire left wall and the red satchel charge at the back to destroy part of the rear wall.
Third shot - Aim the lift shot at the score token on the right then curve it to the left. Hit the right side of the front wall/tower and destroy the large tower behind it as well.
Fourth shot - There should be three towers and part of the front and rear wall remaining. Aim for the three towers and triy to get the score token between the first two as well.
**This is the easiest level to achieve the Who Needs Friends? achievement on, to achieve it easily use this guide below on another account to barely achieve a gold medal. Then go on your main profile and follow the alternate solution for shot 4 to beat your other score.**
First shot - Aim right and fire through the score token above the hill. Curve the shot down to the left and hit the satchel charge there. Hopefully shot should bounce around a little and take out a few towers, and you should end up with a 2x multiplier. If you do not have the 2x multiplier, start over.
Second shot - Fire at the hot goblin over by the castle and try to make it pass through as many of the remaining towers in the back as possible. This should take you to a 3x multiplier.
Third shot - Fire so you hit below the satchel charge on the big pillar that holds up the bridge. It should then continue to bounce and take out another satchel charge on a wall in the back. You should now have a 4x multiplier which should put you very close to gold. If it somehow hits a 5x multiplier here, restart the level or use a mulligan, as your score will likely be too hard to beat.
Fourth shot (Solution 1, for barely achieving a gold medal) - You should now be close to gold, hit one or two of the remaining score tokens, followed by just a bit of destruction, make sure you get just barely enough to get gold.
Fourth shot (Solution 2, for main profile to beat solution 1) - Hit a score token, and try to find an area left to cause lots of destruction, all you need to do is get higher gold medal than you dd on solution 1.
First shot - Aim as far left as you can, arching the shot pretty high. Try to hit, one, or both, of the score tokens, then curve to the right, and take out the entire left wall. I had to activate the speed shot almost at ground level.
Second shot - Aim the bomb shot at the middle of the large castle. Make sure the thin layer of wall above the indestructible wall is highlighted. Wait for the hot goblin to move into your aim. then release your shot. Let the bomb shot explode on its own, and it should take out most of the large castle.
Third shot - Aim at the right bounce icon, then grab the close 5k score token. Curve to the left to line up the speed shot with the three towers on the right wall. Once activated, the speed shot needs to blow up the right red satchel charge and take out all three towers, and the entire right wall. You must destroy all three towers here, so use mulligans if you need to, this shot is tricky.
Fourth shot - You should already be at the 5x multiplier, so you shouldnt need much. Aim for the very top of the 10k score icon and hit the tower behind the icon which should blow up the remaining red satchel charge.
First shot - Aim your lift shot with full power to the left, collecting the spring shield. Start curving right aiming to fly above the left castle. Use 2 of your lift activation's to reach another spring shield above the left castle. After you collect it start to curve a lot to the right. With a bit of luck you should reach the left wall of the central castle so that you are facing the right castle. Use the last of your lift activation's just before you hit the castle so that you have enough power to take both castles out. You need to take out both castles here to get a high multiplier.
Second shot - Aim for the spring shield and collect the 10k bonus icon. Curve to the left and break though the roof. Detonate once you're close to the tower part inside. This should give you 4x multiplier and enough points for gold
Third shot - If you still don't have gold, you should be close. Hit a remaining part of rubble left or try to hit a bonus icon.
First shot - Aim to the right with not too much power, pick up he bonus icon then start curving left towards the two big towers. The goal is to shoot to the right and curve to the left so that your first shot takes both the towers down, but more than likely you will only take out one and then most of the second.
Second shot - Finish up taking out part of the tower you didn't completely blow up.
Third shot - With the split shot take the whole wall and collect all 4 bonus icons.
Forth shot -Get a 5k bonus icon and blow up the gate.
First shot - Aim right and curve to hit the speed icon, make sure you are in the right spot to hit the bounce icon and take out all of the towers on the right side of the map.
Second shot - Aim low with full power to hit the 5k icon at the very bottom, then bounce back up to hit the 5k icon right in front of the castle wall entrance. Bounce up again (You may need to use 2 bounces) to just barely go over the castle wall. Hit the speed icon into the satchel on the unbreakable wall, it should bounce you into the 10k bonus icon behind you and the satchels on the castle wall blowing the entire thing up except the right side.
Third shot - Hit the middle bonus 5k icon, curve left to hit the hot goblin, and keep curving to hit the 5k bonus icon right in front of the left wall. Take out the entire left wall, this should get you to 4x multiplier and the gold medal.