A semisolid platform that starts moving in a certain direction when Mario steps on it, and then it changes direction every time Mario steps on it again. The current direction is shown by an arrow in the center of the platform. It doesn't interact with other sprites or with objects.
Optionally, you can set a timer that activates when the platform starts moving and makes the platform disappear when it reaches 0.
Some properties can be changed in the asm file (speed, order in which the directions change) while the timer is set by the "extension" field in the sprite insertion dialog.
More information can be found in the asm file.
Ice Man Edit for v1.1:
Now supports various initial directions to start with relying on extra byte 1 instead of going to the right only!