Ice Mode can be triggered by harnessing Ice energy. In Team Sonic's case, they could harness Ice energy after their Communicators absorbed some from a fissure. When utilizing Ice Mode, the users envelop themselves in a freezing blue aura. Anything they come into contact with are then instantly frozen solid. Even the user's steps will cause ice to sprout from the ground or from any rails the user is grinding on. This effect can be channeled through weapons as well, like Amy's Hammer and Tails' Blaster. As a side-effect, the user constantly leaves a blue and white color trail.
Ice Mode is one of the core gimmicks in Sonic Boom: Fire & Ice, and is available to all playable characters in the game. It is primarily used to create platforms to travel across obstacles, like spikes. While Ice Mode is active, the player can freeze blocks of water with snowflake icons that they or their attacks touch, creating solid blocks for the player to walk on. The player can as well freeze Water Spouts to create Rails. To melt and counteract the Ice, the player has Fire Mode. Otherwise, any frozen water will re-thaw after a couple of seconds. In some sections though, the player will have to switch to Ice Mode more often than not. Ice Mode also affects the playable character's abilities, affecting their visual effects and ways of eliminating enemies, causing the latter to be frozen in ice before they blow up, although these are purely cosmetic changes.
To use Ice Mode in gameplay, the player can toggle between it and Fire Mode using the L or R button. When Ice Mode is active, the Nintendo 3DS's lower screen will show ice crystals and snow around the lead character's icon.