Okay so in level 82 of the current event, there's a magic portal that lets you enter a blocked off part of the playing field. For whatever reason, this portal would not allow my yellow birds to enter. I couldn't attack the pig there except with a black and blue bird. Since it's a yellow excavation event, my 3 yellow birds were most powerful. I wasted a LOT of money on gems to beat that ONE PIG. I'm very angry about this and I feel like the game cheated there just to milk money from me. I don't mind spending money for some advantage in playing, but the game shouldn't just change the rules in the middle of a 5-wave level. If this is how it's going to be, Rovio shouldn't expect people to just fork over hundreds of dollars after working so hard to FINALLY get to level 82 in an event.