Flawless Run Achievement
Collect all Life-Ups without losing a life in Levels 4, 5 & 6.
You won’t have unlocked the first bonus level at this point, but the levels are not hard. Just take the level slow to avoid hazards and be sure to look around for life ups (a clown’s head with “+1” under it). Levels four and five have four life ups each and level six has five life ups. If you are struggling, come back to the difficult level after you have unlocked the first bonus level and the three hit protection.