Dejiko no Mahjong Party

Dejiko no Mahjong Party
Developer: Studio Saizensen Publisher: King Records Platforms: Game Boy Color Released in JP: December 8, 2000 This game has hidden development-related text. This game has a hidden sound test. This game has hidden bonus content.

You can't have a party without mahjong!

Unadvertised Cross-Game Multiplayer Mode

Dejiko no Mahjong Party is built off the same game engine as Broccoli's other mahjong games, Shinseiki Evangelion: Mahjong Hokan Keikaku and Kidou Senkan Nadesico Ruri-ruri Mahjong, sharing UIs, the majority of non-character related graphics and game systems.

Rumours surrounding the possibility of a Cross-Game link for multiplayer matches between these games existed through the 2000s, which in March 2015 Japanese Twitter user IkamanS2 demonstrated were in fact true.

Sound Test

Game Genie code 091-D3F-F72 will start the game in a sound test.

Development Related Text

Located at 0x144000 is development text also implying that debugging features existed at one point.

CHR01
CHR02
CHR03
CHR04
CHR15
CHR16
CHR17
CHR_SET
PLC01
PLC02
PLC03
PLC04
PLC05
PUT_CHR
TN_CHR
TN_CNT
INIT
STARS
TN_LOSE2
TN_MAN
TN_SPLAY
PRTCHR
PRT_BG
TN_JUDGET
TN_PARTST
YAKU_CHKT
SHOWITEMU
TN_LOSE
DEBUG
ENDING
FREE
GAMEOVER
GET_P
LUCKSYS
MJ_HELP
SERIAL
TIME
CARD
CARDCHK
DEBUG_SW
TN_CHR
TN_DEBUG
TN_TRC
WORD
APOSTLE
BEGINNER
BG_01
BG_02
BG_03
BG_04
BG_05
BG_06
BG_07
BG_08
BG_09
BG_10
ITEM
TN_PRO
GETITEM
GETITEM2
GET_TRC
OMAKE
TN_OPEN

PRTCHR

is found at 0x14802D, 0x148098 amongst 970 other places in the ROM.

In addition, prompts for a debug menu can be seen in Shift-JIS format at 1581F4.

(Source: nensondubois)