One Down is the second level of the Light World of The Hospital in Super Meat Boy.
It features multiple walls of needles that need to be weaved through to traverse the level safely.
Strategy[]
There are 3 ways you can complete this level. You can wall jump in between the gaps like you are supposed to, or you can fall all the way down to the second ledge on the right and then fall to the left and quickly go to the right to reach Bandage Girl. Be careful though, because this is a somewhat difficult strategy. Another way is by using Jill to float your way down to Bandage Girl.