God Hand

Fighting Ring challenges:
Complete Stage 1.

Bonus Arena Challenges:
Successfully complete the game to unlock Arena Challenges 41 through 50. Successfully complete Arena Challenges 41 through 50 to unlock Arena Challenge 51.

TV,:
Complete Arena Challenge 51 to unlock a television in the shop. It is used to view trailers.

Hard mode:
Successfully complete the game under the normal difficulty setting.

Chihuahua Race:
Complete Stage 2, then talk to the male NPC in the shop.
Wurd.

Alternate costumes:
Successfully complete the game to unlock the Carnival, Devil Hand, Karate, and Olivia's Bunny Girl alternate costumes. They can be obtained by starting from Stage 2 then talking to the new NPC in the shop.
iriisedoc.

Hint: Jukebox CDs:
Complete the indicated task to unlock the corresponding CD for the jukebox.

Jukebox A: Complete the game.

Jukebox B: Go to the casino for jackpot pulls and get a ticket for the Jukebox CD.

Jukebox C: Complete the game under the hard difficulty setting.

Jukebox D: Complete the game with the "Kick Me" sign on without using any GodHand Reels or Godhand Power.