Win all gold medals in the men's events in championship mode. Press L or R at the character selection screen to access the costume. Note: Using this costume will disqualify you from winning medals or setting records.
Big heads in K120 event
Press L, R, L, R, L(2), R, L before the K120 event starts.
Big heads in K90 event
Press R, L, R, L, R(2), L, R before the K90 event starts.
Big heads in Mogul event
Press Up(2), Down(2), Left, Right, Left, Right, L, R before the Mogul event starts.
Penguin costume
Win all gold medals in the women's events in championship mode. Press L or R at the character selection screen to access the costume. Note: Using this costume will disqualify you from winning medals or setting records.
Robot costume
Win all gold medals in the men's and women's events in trial mode. Press L or R at the character selection screen to access the costume. Note: Using this costume will disqualify you from winning medals or setting records.
Bear costume...