With only 2 birds to save and 27 moves to go, you might be tempted to use the Grappling Hook straight away. However, there are a number of obstacles in your way, quite literally, and first they must be smashed through in order to reach those keys at the bottom.

The furthest side of the grid has Iron Blockers without a piece of armor. Focusing on those obstacles in there will be easier. If you choose to follow this method and only occasionally smash through the left side of the grid, then it is paramount that you guide the birds through the right teleporter. If somehow one of the birds ends up on the wrong side, just ignore it until all the obstacles on the right are gone. Then just swipe once with the Grappling Hook and the objective should be over. 

Just keep in mind to never have a bird stuck above an obstacle as that space will be required for a match at some point. 

Force Field Tower Levels
Level 51Level 52Level 53Level 54Level 55Level 56Level 57Level 58Level 59Level 60

Level 61Level 62Level 63Level 64Level 65Level 66Level 67Level 68Level69Level 70Level 71Level 72Level 73Level 74Level 75Level 76Level 77Level 78Level 79Level 80Level 81Level 82Level 83Level 84Level 85Level 86level 87Level 88Level 89Level 90Level 91Level 92Level 93Level 94Level 95Level 96Level 97Level 98Level 99Level 100