Mostly Unpublished NES Cheats ;)

red    marked cheats are unique, not listed on any site (tell me if not).
brown marked cheats from various other sources like etc, checked and fixed if necessary.
gray   marked disabled or missed cheats buried inside game ROM.

  Valis - The Fantastic Soldier
  Valkyrie no Bouken - Toki no Kagi Densetsu
  Vegas Connection - Casino Kara Ai wo Komete
  Vegas Dream, Viva! Las Vegas
  Venus Senki
  Volguard II

Cheats summary:
generic cheats-1
unique cheats-7
buried secrets-5
fixed generic cheats-0
unverified games-0
games with secrets-7
games with no secrets found-3

Valis - The Fantastic Soldier

(GEN) Sound test:
Hold Right on controller 2, then press Reset. At the title screen, release the button and by pressing the A on controller 1 ou can change the background music.

Valkyrie no Bouken - Toki no Kagi Densetsu

(UNI) Suicide (added 20.04.15):
During the game, pause it, then press A + B on controller 2.

(BUR) Hidden text (added 05.02.13):
The game contains a generic Namco's copyright text:

(BUR) GameGenie (added 05.02.13):
GEONVTEI-There are a series of the Namco games, made by the same programmers Haruhisa Udagawa and Kumi Hanaoka, that contains the same self-test for the data integrity. To enable any of these tests you need a special device that should be plugged into the expansion port. The operation of that device is very simple. It should accept the data bit from the data input port and return it back inverted to the output data port. The device consists of 4-bit shift register, working as some sort of the FIFO buffer. The input bits are goes to the input and then shifted to te output after a 4 cycles. At the game's boot, it tries to send some special data to the device. If the data output doesn't match the data input inverted, then the game continues the normal operation. But if all data (usually 32, rarely 64 bytes) is matches, self-tests will be performed. The program calculates 24-bit partial checksums for the PRG (excluding the last 8K) and the CHR data, summing only every 15th byte, and comparing it against the etalon. Before testing of the PRG data, the background color turns red, before testing of the CHR data, it turns green. If any of these tests are failed, the program will jump directly to the reset routine. It means, one of these tests will be performed infinitely, but until the special device is plugged in, or until the test are passed. Normally, you'll see the red to green flash just before the game's boot. Or the static red screen if the PRG data is bad, or the flashing red to green screen if CHR data isn't good. Using this Game Genie code you can skip tests for the special device presence and jump straight to the integrity tests.

Vegas Connection - Casino Kara Ai wo Komete

(UNI) Sound test (added 15.12.07):
Hold A + B on controller 1, then press Reset.

(UNI) Message speed (added 15.12.07):
Hold Right on controller 1, then press Reset.

(UNI) Different slot graphics (added 20.04.15):
Start a "CASINO" game mode, select "SLOT MACHINE". While selecting a line number for the slot machine, hold one of the following combinations on controller 2 to change the slot graphics to corresponding tileset.
Right + A + B-Faces
Left + A + B-Dinosaurs
Down + A + B-Clothes
Up + A + B-Robots

(BUR) GameGenie (added 15.12.07):
GKVVAKOX+VUVVPKXA+SVVVZGSA-Re-enabless the backgrounds test. Use the "Sound test" cheat to start.
GKVVAKOX+AXVVPKXA+VVVVZGSA-Re-enabless the character test. Use the "Sound test" cheat to start.

Vegas Dream, Viva! Las Vegas

(UNI) Debug mode (added 29.06.09):
Start a new game, select the game type, enter a name or select available names, proceed to the game selection screen. Press Up, Down, Right, Left, Up, Down, Right, Left, A, B, A, B, B (for the US version) or B, A, A, B, A, A, B, A, A, A, B, A, B (for the Japanese version), a sound will confirm correct code entry. Hold A + B and press Start to enter the "MESSAGE TEST" mode. There are two options "ENGLISH" and "JAPANESE". In the Japanese version you can switch between them during the game by pressing Select instead of A at end of the dialog message. In the US version there is no japanese font, and you can't switch the language, althought the japanese messages library is present in the ROM. Additionally, set cursor to one of the games, hold A and press Start to enable corresponding debug mode from the table below.
"BLACK JACK"-Ending sequence.
"ROULETTE"-Game Over sequence (lucky slot).
"SLOT MACHINE"-Face test mode.
"KENO"-Sound test mode.

(BUR) Hidden text (added 29.06.09):
There are hidden version text inside the game ROMs:
MIX ID : n.gotoh1989-10-01Ver1.1
for the US version
VIVA! LASVEGAS 1988/06/17
for the Japanese version. Also, the RESET routine in this game uses string
to check if game was soft or hard reset.

Venus Senki

(UNI) Secret passwords (added 29.01.14):
はるぼういち-Stage 1
はるぼうに-Stage 2
はるぼうさ-Stage 3
はるぼうし-Stage 4
はるぼうご-Stage 5
はるぼうろ-Stage 6
はるぼうなな-Stage 7
はるぼうはち-Stage 8
はるぼうく-Stage 9
はるぼういちまる-Stage 10
はるぼういちいち-Stage 11
はるぼういちに-Stage 12
はるぼういちさ-Stage 13
はるぼういちし-Stage 14
はるぼういちご-Stage 15


(BUR) Hidden text (added 10.08.12):
There is some copyright text inside the ROM.
(c) 1991 Western Technologies
Nintendo Release #3

Volguard II

(UNI) Secret words (added 27.11.08):
At the title screen, set the level to "2", start a new game and beat the defaul score record. Enter following word as a player name to the hi-score record. Start a new game again, press Start to pause it, then press Up + Down + Left + Right + B + Select combining buttons from both controllers. For example, press Down + Right + B + Select on controller 1 and Up + Left on controller 2.


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