Hazards and obstacles
A playable character is often susceptible to be frozen in a chunk of ice which immobilize them. Freezing is often cause by Freezing Machines or Badniks with freezing weapons, such as E-07 Ice Ball. To break the ice, the player must press the jump button repeatedly. Sometimes, Springs, Item Boxes and other objects may be frozen solid which require a Spin Jump to break them free for use.
Icicles' purposes are often two-fold. In some cases, Icicles work much like spikes, causing damage to the player upon contact. In games like Sonic Adventure and Sonic Unleashed however, the player can hold onto large icicles and jump between them to reach new areas. In such cases though, the playable characters may lose their grip if they hold onto them for too long.
Some surfaces are frozen over by ice, resulting in less friction. As a result, the playable characters will be prone to automatically slide across such slippery surfaces when moving on them, making it more difficult for the player to control their movements.
Attacks and powers
In a number of games, Ice has been incorporated as a special power or gimmick that the player can use in conjunction with their attacks for more potency or as a separate power/power-up to enhance the player's performance.
Sonic the Hedgehog CD
Sonic the Hedgehog 3
In Sonic the Hedgehog 3, the first winter-themed Zone was introduced, namely the IceCap Zone. This Zone utilized a few ice hazards such as freezing and icicles, common elements later used in future winter-themed Zones.
Sonic 3D Blast
In Sonic 3D Blast, the player can be frozen by various means, though it is still possible to slide along frozen surfaces while being frozen.
In Sonic Adventure and Sonic Adventure DX: Director's Cut, Sonic and Tails can traverse across icicles in the Icecap. However, they will slip off gradually if they hold on for too long. The Ice Stone is needed to access Icecap.
Sonic Rivals series
In Sonic Rivals and Sonic Rivals 2, Ice is one of the games' Power-Ups that can be used both offensively and defensively depending on whether the player is losing or winning respectively. When used offensively, the player will launch an orb of ice that tracks down the opponent and freeze them in a cube of ice, and when used defensively, the player drops a cube of ice that will freeze the opponent upon touch.
In Sonic Unleashed, the terrains in both the daytime and nighttime Acts of Cool Edge are covered in frozen surfaces. In addition, there are nozzles that blow chilling winds and enemies like the Egg Blizzards and Dark Moray that can freeze Sonic the Werehog and deplete his health gauge considerably, which requires to move the control stick quickly. Oppositely, the player can use enemies and other gimmicks to freeze opponents, making them easier to attack.
Sonic Chronicles: The Dark Brotherhood
In Sonic Chronicles: The Dark Brotherhood, the game has an element system common with most fantasy RPGs. Ice is one of its elements. Robots, Zoah and Voxai are resistant to ice while Kron, N'rrgal and other organic opponents are weak against it. Chao like Griff and equipment such as Ice Rings add ice damage to attacks.
Sonic & All-Stars Racing Transformed
In Sonic & All-Stars Racing Transformed, ice appears as an offensive weapon in the form of snowballs that can be thrown at opponents to stop them or slow them down. The Ice often comes in sets of three and can be thrown both forward and backward.
Sonic Lost World
In Sonic Lost World, a number of Zones in Frozen Factory have frozen surfaces. However, rather that serving as a hindrance, it is incorporated into Sonic's movements. As such, when moving across such surfaces, Sonic literally skates down them at high speed and uses axel jumps when jumping.