Crash Nitro Kart

Play as Dingodile:
Do all the red coin CNK challenges in every world. Next, go to Velo's Vault and go to the Red Gem cup. After that you must win three races and get a Red Gem and Dingodile.
Vanessa Tuau.

Play as Emperor Velo:
Complete the game 100% as Team Cortex in adventure mode. Note: You may need to play previously as Team Bandicoot.
thor gaffney.

Play as Fake Crash:
Get over 50 boosts on a track as Team Cortex in adventure mode.

Play as N. Trophy:
Defeat all N. Trophy ghost racers in race time trial mode.

Play as Polar:
Get one Blue Gem.

Play as Pura:
Get over 50 boosts on any track as Team Bandicoot in adventure mode.

Play as Real Velo:
Get two Scepters.
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Play as Zam:
Get one Purple Gem.

Play as Zem:
Get one Green Gem.

Hyper Spaceway track:
Finish in first place in all sixteen races in adventure mode. This includes the four Boss races as well as the twelve normal races. You will then be challenged by Velo to a race on the Hyper Spaceway track, which will now become unlocked in the other modes.

Slide Coliseum track:
Get all of the Time Relics.
Gsisland81192.

Terra Drome track:
Get all purple tokens in adventure mode.

FMV sequences:
Accomplish the following tasks to unlock the corresponding FMV sequence at the "Extras" menu.

Team Bandicoot
Challenging Krunk: Win three trophies.
Krunk Loses: Get one key.
Challenging Nash: Win six trophies.
Nash Loses: Get two keys.
Challenging Norm: Win nine trophies.
Norm Loses: Get three keys.
Challenging Geary: Win twelve trophies.
Geary Loses: Get four keys.
Challenging Velo: Get four keys.
Losing to Velo: Get four keys.
Defeat Velo without 100%: Get four keys.
Defeat Velo with 100%: Get four keys, thirteen Relics, and one Scepter.

Team Cortex
Challenging Krunk: Win three trophies.
Krunk Loses: Get one key.
Challenging Nash: Win six trophies.
Nash Loses: Get two keys.
Challenging Norm: Win nine trophies.
Norm Loses: Get three keys.
Challenging Geary: Win twelve trophies.
Geary Loses: Get four keys.
Challenging Velo: Get four keys.
Losing to Velo: Get four keys.
Defeat Velo without 100 %: Get four keys.
Defeat Velo with 100 %: Get four keys, have thirteen relics, and one Scepter.

Hint: Android Alley: Shortcut:
If you get a boost weapon, keep it. About halfway through the track you will see a corner with a bit missing off the fence. Use the boost weapon and drive through the window. Use this if you want to cut that corner. Also, Aka Aka, Uka Uka, or Emperor Velo will work.
Matthew Hall.

Hint: Clockwork Wumpa: Shortcut:
Get past the gears that splatter you if you get too close. When you go in the clock tower, do not turn left. Instead, go straight, jump on the gear, then follow the rest of the gears. This helps when you are trying to defeat N. Tropy's ghost.
Jesse Lesniowski.

Hint: Deep Sea Driving: Shortcut:
During this track you will reach three boosts in a row. On the third boost, jump to the right. You should land on a platform. Use this if you want to cut that corner.
Matthew Hall.

Hint: Hyper Spaceway: Shortcut:
After the boosts with the fire part, you will go through a warp and exit in a mountainous region. After a few jumps, move to the left side of the ledge. Before the last jump, turn sharply to the right. You will drive off a ramp that will take you to the next part. Be sure to use jump boosts or you will not make it.
Luke Kovacs.

Hint: Inferno Island: Token letter:
To get the CNK token letter that you see in the air during this race, after you have gone over the first bridge, find an opening between the end of the bridge and the wall. Drive into the water closest to the wall and you should end up on top. Note: Do not use this as a fast cheat because it takes a while for Aka Aka (or Uka Uka and Emperor Velo) to get you up there.
Matthew Hall.

Hint: Jungle Boogie: Token letter:
During the race you will see a track with a fence in the air. Use the hill to jump on it. There is a CNK token letter up there.
Matthew Hall.

There is a jump that has the CNK token letter "C". If you get a power weapon, save it until the next lap. If you line it up correctly, you will get on the jump. Then, press R to jump and get the token before jumping back onto the race course. This does not work in lap one, as you need speed as well as the power weapon.

Hint: Jungle Boogie: Shortcut:
About halfway through the track you will see a piece of hanging track on the left. Go directly next to it and hold R. Make sure your car goes on the track. This is useful in time trial mode, as there are a few boxes up there.
Sjbyres.

Hint: Meteor Gorge: Shortcut:
After you get to the jumpy thing, use the speed boost but turn left immediately. You will go over lava and onto a snow lump. After you are on that, press R1 to jump on the track.
Mel Duck.

Hint: Out Of Time: Shortcut:
Jump over the fence with the arrow over it.
SRABOND.

Hint: Finding shortcuts:
To find a shortcut, look for a large red arrow with a yellow outline. Most of these arrows let you go through them (under), the opposite direction, or around them. Be careful, as sometimes when you notice them too late there is not enough time to find or get the shortcut.
thor gaffney.

Hint: Slide boost:
While doing a power slide, press L. This not only helps in general racing but also in situations such as Relic Races where getting certain boxes are almost impossible. Also, if you slide boost three times in a row you will get a slide boost combo. This is a much faster boost than a slide boost, and it lasts longer.
jobidaker.

Hint: Expert driving:
You may have noticed various things that are kind of cheap in the game. For example, the CPU karts in adventure mode are all slightly faster than you are. Use the following trick to counteract this. At the beginning of a race, you always start off with a full boost. As soon as you boost starts going off, try using the extra boost as many times as you can. This is very useful for getting the two secret characters. Do this until you reach a speed boost. Then, take a chill pill and use your item(s) against the racers in front of you if you are not in first place. While in first place, try to use only these three items: Red Ice, Red Electrical Ball, and Nitro. Try to plant them in one way only locations to make them difficult to avoid. Once at this point, keep using the extra speed boost and planting items one after the other. No matter who you face, they will be done racing.
Blinzer555.