The Ice Spring[note 1] is a gimmick that appears in Sonic Mania. It is a variation of the Spring which can only be used once.
The Ice Springs resemble the early Springs, being circular panels with a spring underneath each of them. Ice Springs, as their name implies however, are made entirely of light blue ice.
In the gameplay of Sonic Mania, the Ice Spring works exactly like any other Spring in the game and is used in the same manner, although it does not offer a very high bounce in many cases. What makes this Spring distinguished however, is that after using it once, it will disintegrate into nothing, making it unusable.
Ice Springs are only encountered in Press Garden Zone Act 2. In some cases, they are encased in ice blocks, which must be shattered before they become usable. Also, their fragility are in some cases used to make them one-time blockades for paths the player can pass through.
↑While not listed in any instruction manuals, the internal files in the PC release of Sonic Mania refers to this object as "IceSpring".