Helium

Helium is an option in Fleeing the Complex during the "Ghost Inmate" pathway.

Henry Stickmin has to cross a small pipeline to reach a vent that will lead to The Docks. When Helium is chosen, Henry inhales a helium cylinder, making his head swell up like a balloon, allowing him to float across to the vent. This results in a success.

Trivia

 * By clicking where Henry will land right before the next choice, he will land safely, instead of collapsing. This is the second landing needed to unlock the achievement, Nailed it.