Midway Gates are checkpoints near the middle of any level in Super Mario World. They appear as two blue and white striped posts, linked by a white bar, thus looking like smaller versions of the Giant Gates in the same game (which serve as the end of a level).
The Midway Gate serves as a save point; if the player loses a life in the same level after passing it, they will restart at that point. The player's character will also grow into their Super form if they are in their Small form when they pass the gate.
Midway Gates do not appear in auto-scrolling levels, underwater levels, or in the Star World or Special World.