30 turns to free 5 birds. The three grids are connected with teleporters and the flow, even if invisible, is reminiscent to a snakes-and-ladders direction. There is only one key however, which means all of the 5 caged birds will need to reach that very same spot. Just keep matching gifts and creating combos, guiding the birds to the bottom. Be mindful not to have too many of these cages together though, as this kind of blockage will make the level almost unbeatable.

Matches in the lowest grid will allow for more gifts to move, so try and focus on those first. You can also calculate quite easily, in which position certain gifts will find themselves in. Lining up vertical striped gifts will especially help in dealing with the very last row. 

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