Here is our strategy for Angry Birds Free Ham ’em High level 12-5. Fire Big Brother through the top half of the first wooden wheel. This will reduce the vehicle to rubble. Launch the first Yellow bird below the larger pig in the middle of the structure. If the TNT on the extreme right does not detonate, snipe it with the last Yellow bird. The score in the video below is 79,690.
Method #2 results in a lower score — 76,590 — but uses only two birds. Launch Big Brother just above the larger pig in the middle of the structure. The larger impact should detonate the TNT on the extreme right. Then fire the Yellow bird through the small wooden square above the first wooden wheel.
1. Aim Big Brother to hit the little square wood block located on top of the left wheel on its lower side. It seems to provide a more consistent pattern of getting everything to cave in on itself to provide a clear pathway for the Yellow Bird. Aiming tip is to have the bottom of BB right at the line of light blue and dark blue in the background. Just a bit above the line also worked.
2. Aim Yellow Bird to hit the vertical wood plank just to the left of the stone triangle that sits on the stone plank. Sometimes hitting the wood plank at the upper intersection of the stone triangle provides enough force to push the structure to the right and activate the tnt. Other times going a bit higher provides the force.