Finally got 3 Stars on Lv 42
1. Collect the bouncing shots and kill the zombie in one shot, ignore the brain.
2. Hardest part, make the two zombies fall next to the red punch box. Can be done in as few as 2 shots but requires a lot of practice.
3. http://img146.imageshack.us/img146/3513/zombielv42.jpg
This picture shows the correct angle at full power to activate the punch-box. Normally, two shots are needed to push the zombies downhill.
4. Once they're down, hit the wall behind the boulder so that the bullet will bounce off and hit the boulder on the right side. Watch the boulder crushing the zombies and picking up the brain on its way.
When your hero dies, the displayed numbers of your troops don't change until he's revived. Pretty misleading to think that you still have 10 Goblins left but in reality they are all dead.
Eplov: Go to Inventory and click on the items you have bought to (un)equip them. You cannot equip two items of the same group at the same time, for example Wallet Belt and Chain Belt.