Hi everybody! I know how to get the chest on lvl 3 =).
First, climb to the highest platform. Then do a skid jump when the blue bird gets tha fartest he can and kill it, u will have a little boost, now keep forward and when u start falling do a double jump. I hope u understand... and if u do u may need a lot of patience and skill to reach it xD. Hope I was of help.
 "MoneySeize"){kind=icon}
 "Papa's Pizzeria"){kind=icon}
 "Bubbles 2"){kind=icon}