Crash Bandicoot: The Wrath of Cortex - Level 28: Ice Station Bandicoot (Double Gem)

This is the game's 3rd extra level, and is unlocked after getting 15 Relics.

Like Ghost Town and Smokey and the Bandicoot before it, Ice Station Bandicoot is a racing level. This time, Crash must use his Copter Pack to race again a carpet-riding polar bear through the air.

Think of this as a combination of Crash 2's Jet Pack levels with the racing style of Crash 3's Rings of Power, because in order to finish the race, you have to pass through all 40 green rings in this level, since they guide you to the finish line. If you win the race, you get a Gem.

Of course, there are still Crates to Smash during this race. You'll get a different Gem as soon as you break all of them. Don't worry about popping the balloons of the Nitro Crates, because there's a green ! Crate for those near the end.
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This level has some back history to it. According to some beta footage, it was originally going to be travelled through on land.