Hold keys 1 through 5 to raise corresponding parts of the Porkerpillar.
If you raise on hump, the babies will slide left or right.
If you raise two humps, and the babies are in between, they will raise up in place.
Nudge the babies with the humps to keep them closer together, or to move them over a little.
This game was originally designed for special hardware.
Traditional keyboards don't always support holding keys 1-5 down all at once.