Snowboard

Snowboards are items used by Sonic and Tails (and once by Blaze) in many Sonic games. They are boards that are built to be used on snow-like terrain.

Sonic the Hedgehog 3/Sonic 3 and Knuckles
In ''Sonic the Hedgehog 3 (& Knuckles), in IceCap Zone, Sonic uses a snowboard at the beginning of the level and rides down the mountain. It is discarded after Sonic crashes into a wall.

Sonic Triple Trouble
In Sonic Triple Trouble, an object known as a "Jet Board" can be used by Sonic in Robotnik Winter Zone. The board allows Sonic to move at high speeds. The board is removed if the player takes damage, or if the player presses both 1 and 2 buttons at the same time.

Sonic Adventure
In Sonic Adventure, Sonic and Tails use snowboards to outrun an avalanche in Ice Cap. Sonic's is light blue with a snowflake, while Tails' is green and yellow.

Sonic Adventure 2
In Sonic Adventure 2, Sonic rips a flap off a helicopter and rides it down the city. It is then presumably discarded. This also happens for a very short section of Metal Harbor where Sonic then takes a piece of a vent and uses it as a snow board.

Sonic the Hedgehog (2006)
In Sonic the Hedgehog (2006) in White Acropolis, Sonic uses a snow board to outrun an avalanche in a similar manner to Sonic Adventure. It is bright blue with orange stripes. In Crisis City, Sonic uses a piece of debris.

Sonic Rush Adventure
In Sonic Rush Adventure At Blizzard Peaks, Tails gives Sonic and Blaze snowboards. These boards are used for most of act 1. They are presumably discarded shortly before the goal.

Sonic Generations
In Sonic Generations, Sonic uses a navy blue snowboard to ride down the first third of City Escape.

Trivia

 * In Sonic Adventure, there is a glitch that makes Sonic use his sandboard instead of his snowboard.
 * In Sonic Generations, Sonic uses a snowboard in City Escape, but in Sonic Adventure 2, he uses a flap he ripped off a helicopter.