Nagano Winter Olympics '98

Ski upside down:
Select Olympic mode and the Freestyle Aerials event. Choose any trick, and down press any buttons while moving downhill. After leaving the ramp, rapidly tap B. The skier will land and jump forward on his head and ski in that position.
Information in this section was contributed by Matthew Harmon.

Special medal sequence:
When you earn a gold medal in every event, including "Championship Mode" gold medal, you will see an ending sequence with credits. To see this again, press Up(2), Down(2), Left, Right, Left, Right, B, A at the awards screen to view the first sequence. Press Up(2), Down(2), L, R, L, R, B, A at the awards screen for the second sequence.
Information in this section was contributed by Kenshin.

Random names:
Select any event and country. Leave the name blank and press Start.

Faster curling event:
Press Z after your character or the CPU has thrown the stone.

Control CPU curling:
Press A or B after the CPU has thrown the stone.

Hint: Bobsled short-cut:
Begin the Bobsled event, and wait for the second left turn. Hold Analog-stick Up and press Z + A + B to jump the track and end up ahead.

Hint: Aerial landings:
During the Aerials, press B as soon as you hit the ground and keep the button held until fully landed.
Information in this section was contributed by Jim Donohue.

Hint: Snowboarding Halfpipe gold medal:
Execute a combination of F Alley Oop, and Alley Oop during the Halfpipe competition.
Information in this section was contributed by Jim Donohue.

Do a Mctwist Tail (A, B, turn left, A, B two times), Crippler (Right, A, turn left, A two times), 720 (B, turn left, B, Left two times), 540 (A, turn left, B three times), 3D Crippler Double Hand Grab (Left, turn right, B, Left, A, Left, B). Combine them (do 720 and Mctwist Tail more) and if you complete everything you will easily get 35.5 points.
Information in this section was contributed by Cristobal Alfonso De Leon Benitez.

Hint: Speed skating stamina:
If your stamina is low, take a break during the turns, and not the straightaway.
Information in this section was contributed by Jim Donohue.

Hint: Alpine skiing giant slalom:
Stay as tight as you can when you turn to the next gate. If you hit the flag, keep staying tight to increase your speed.
Information in this section was contributed by Jim Donohue.

Hint: Snowboarding giant slalom:
Edge by using A immediately after clearing the flag.
Information in this section was contributed by Jim Donohue.

Hint: Curling:
It is best to be second in curling. The CPU will always try to hit where you can not get in the middle. Keep knocking the CPU's stones out until the last curl, then go for the middle.
Information in this section was contributed by Jim Donohue.

After throwing your stone, press Z to speed up the game. Press A or B to control the CPU's stone after it is thrown.