This video demonstrates how Speed and Slowing platforms are used.
Speed platforms can be strategically placed to allow access to previously inaccessible areas of the map.
Slowing platforms can be used as obstacles, placed between certain key points in the map, requiring you to go over them to gain access to other areas.
Slowing platforms will constantly have 5 enemies on them while a player is on them. These enemies die in one hit from anything, but hit much harder than normal. Be careful, as they will kill you rather quickly! When you kill one, another will spawn. These enemies will also drop Bridge Blocks on occasion.