The fourth game in the Henry Stickmin series is called
Infiltrating the Airship.
It is called Episode 3 of the Henry Stickmin narrative and is the
follow-up to Stealing the Diamond.
It occurs before Fleeing the Complex.
There are four real endings and one false ending in the game.
Press W, D, X, Up, Right, or Mouse to move the cursor ahead.
Press S, A, Z or the Down or Left arrows to turn in the other
direction.