The phase is similar to Phase 1, but there are two smaller platforms which are to the sides and above the main platform, and both of those smaller platforms have a green Balloon Bird. The main platform still has the three pink Birds.
Like Phase 1 and 3, this level is not repeated later in the game.
The collision for the bottom platforms extend further inward by 2 pixels on each side compared to every other phase in the game. This is possible because the collision for each phase is completely separate from the visible platforms.