One Side Collision Block (block category)

A one side collision block is a type of foreground which restricts the player from passing the block in a certain direction.

List of Horizontal One Side Collision Blocks

Items	Special Function
One-Way Block	This item can be placed in two directions.

List of Vertical One Side Collision Blocks

Items	Special Function
Cosmic Rain	None.
Waterfall	None.
Castle Sewage Pipe	None.
Sunnyside Yolkfall	None.