On the course Sick With It, there is a glitch in the game that will actually warp you to the other side of the course. About half-way through the course, in the area with all the fallen-down trees you can grind, are two paths. One path eventually leads to an area of mogles. The other path leads to a straight-way with two small hills. The ''warp-zone'' is on the straight-way. When you're coming to the first hill, stay in the middle, but aim off to the left. Jump when you reach the top of the hill, and try to land in the snow on the mountainside. If pulled off correctly, you will fall through the mountain, then be transported to the other side of the course, in the mogles.
I know this trick can work because I've pulled it off several times already. This was in 2-player, by the way, in case that makes a difference.
On Gate Challenge Mode, Beat The High Score On Each Course To Earn The Trophy For That Course. Once You Have Earned The Right Amount Of Trophies You Will Unlock That Course!
Unlockable
How to Unlock
Alternate Costumes
Complete expert with any character
Alternate designs for all boards
Get 18 Time Trial coins
Alternate skins for all regular boards
Get all time trial coins, including the ones in extreme championship
Character BONES (Skelleton man)
Beat extreme mode whit ROB
Character CRYSTAL (CRYSTAL women)
Beat extreme mode whit AKARI
Character FROSTY (Snowman)
Beat extreme mode whit RICKY
Character MIMI (mosse)
Beat extreme mode whit TARA
Character TITANIUM
Beat extreme mode whit KEMEN
every characters 2 board
get 2 timetrailer coins
every characters 3 board
get 5 timetrailer coins
every characters 4 board
get 9 timetrailer coins
every characters different logos on ALL boards (exept special boards)
get ALL timetrailer coins
Extreme championship
Complete expert championship
Fourth board for everyone (8-Bit Soul, Bad Cat, Pulse, Conquest, Backbone)
Get 9 Time Trial coins
Mr Beakes Board (Penguin)
Earn 2 Trophies
NST 1080 Avalanche (Jet Rocket)
Earn 18 Trophies
Old school board
Get 4 coins
Old School Board(NES Control Pad)
Earn 5 Trophies
Paintbrush board
Get 7 coins
Penguin board
Get 1 coins
Powder Painter (Pencil)
Earn 9 Trophies
Second board for everyone (Winterborn, Once Bitten, Scaretactix, GCN, Crime Scene)
Get 2 Time Trial coins
Third board for everyone (Mind Invasion, Happiness, Cold Front, Broken Forest, DNA)
To open up a hidden match race mode, "Extreme", beat all three standard difficulty levels. Once you have beaten Avalanche Alley: No Way Out, the Hard final challenge, wait for the credits to finish. The extreme course will now appear on the Match Race main screen