I was totally loving this angry birds game, as I came to level 87 it was getting difficult to get through the very last stage of the level. Level 88 was too easy and a little tricky on 89 but it is impossible to pass level 90. I purchased a pack for $2.99 I waited for it to load after payment but as soon as the level opened the only bird I bought in the pack was already flying without me touching my screen. I've been trying to pass this level since the first day I downloaded the app. I love it!