Scam

So the only way you can get a new character now is through these special events. You need 4000 red coins to buy the characters but are expected to use 500 gems to have enough turns to "win" the top prize of 1000 red coins. For those of us that wont spend hundreds of dollars on the gems, its pointless to try. Judging by the fact one or two players always seem to be at the top of the leader board with double the coins from the next best player, its obviously a Rovio employee plant that gets players to spend their gems to try and reach the top. As it stands, you can only gain low thousands of red coins that let you buy accessories for existing bots.

Fgaefbyetegb about Angry Birds Transformers, v1.13.1