Slider tile

Ice floes (or slider tiles) are environment modifiers that appear exclusively in Frostbite Caves. They are ice sheets that float on tiles filled with water and have a zombie hand frozen inside. The index finger points up or down based on the direction it will divert zombies. Most zombies that step on it will move into another lane adjacent to it. Ice Weasels and Dodo Rider Zombies can bypass them because of speed and flying capabilities.

Trivia

 * The game refers to them as both ice floes and slider tiles.
 * The ice block appears to be floating in a strange navy blue liquid, however, this could simply be darkened water.
 * Sloth Gargantuar holds an icicle that appears to have a hand similar to the hands in the ice floes inside it.
 * All hands frozen inside the ice sheets are zombie hands.
 * The elbow joint of the hand in the ice floe is oddly close to the wrist.
 * Completing a level without letting Ice Weasels touch the tiles gives the player the Run Weasley achievement.