Muchi Muchi Pork!
Unlocking Harahara Mode and Manpuku Mode

Harahara Mode:
Insert coin
Player 1: Press A, B, Right, Right, C, C, Left, B, Left, A, A, Up, Down
Hold Down and press Start to select this mode

Manpuku Mode: 
Insert coin
Player 1:  Press Right, Left, Left, B, B, B, Down, Left, Up, A, B, Right, C
Hold Up and press Start to select this mode