The following is a prototype of Casper for the Nintendo Game Boy, published by Natsume. It appears to be much earlier than the build released a while back by Nintendo Player. I highly recommend reading their article on it, where they interviewed multiple people connected to the game’s development!

Please note that both the original dump (as well as a modified dump for emulator compatability) are included within this release.


Screenshot Screenshot Screenshot


  • It’s possible to force the game to advance to the next areas without completing the minigames.
  • The only playable minigame is OOZ Blaster (accessed via pressing the start button).
  • Sprites and HUD contains differences
  • When Casper is moving to the next area, a small cutscene plays (which are quite similar to the retail).

ROM Information

----| File Data |--------------------------------------------------
System:             Nintendo - Game Boy     
File:               Casper (Prototype).gb
BitSize:            64 Mbit
Size (Bytes):       8388608
CRC32:              2EB0C568
MD5:                F803E8601BF9E6B156B3D24D2451795F
SHA1:               FC0034C3C42DFDDDA28C980E29EA6C5C979FDC52
SHA256:             098464CC434D758A2E00BB70EA8FC545F72D84919D41683AABEAA79CC5F87AB8
----| Header Data |------------------------------------------------
Entry Point:        0x034AC3F3
Logo Code:          Ok
New Licensee Code:  N/A
SGB Support:        0x00 (No)
Cartridge Type:     0x00 (ROM)
ROM Size:           0x00 (Bad; 256 Kbit; 32768 Bytes)
RAM Size:           0x00 (None)
Old Licensee Code:  0x00 (Unknown)
Version:            0x00 (v1.0)
Header Checksum:    0xE7 (Ok)
Global Checksum:    0x0000 (Bad; 0xD920)

Board / Cartridge Images

PCB Front
Cart Back

Special Thanks

Massive thanks to Clarkzer0 for sending this in for release!


Download Casper (USA) (Prototype)