Castle Quest (NES)

Various Debug Tests
Enter any of the following Japanese words as a Player 1 name in any game mode. (Note that nigori and panigori symbols should be entered separately.)
 * たろっと: Tarot - Tarot cards viewer
 * でも: Demo - Demo sequence viewer
 * くみんしーど: Kumin Seed - Ending sequence
 * もりきゅう: Wood 9 - Special round
 * よこがお: Profile - Character viewer
 * さしえ: Illustration - Picture viewer
 * とらんぷ: Playing cards - Playing cards viewer

Debug Monitor
Enter the Japanese word もにたー (tester) as a Player 1 name. You can watch the RAM area from to  with all the info about the RAM variable function, and can change a lot of parameters.

From left to right, the headings are アドレス (address), コマンド (command), and データ (data). トーン means "tone".

Use Up / Down to select the desired RAM address. Press A / B to enter and Up / Down to navigate the menus.

Programmer's Daughter
Enter the Japanese word おおくほななこ (Ookubo Nanako) as Player 1's name. A young girl will appear and give a speech:

As indicated below, the programmer's name is Ookubo Ryouichi, who had in 1985 worked on developing the NES Battle City with the small software company Tomcat Systems. That game has an Easter egg noting that the game was "WRITTEN BY OPEN-REACH WHO LOVES NORIKO", while the title screen of this game has a copyright for "OPR", presumably short for "OPEN-REACH".

The games are separated by five years, and present in this game is the nearly-three-year-old daughter of the programmer.

One-Eyed Woman
Enter the Japanese word なかしままさと (Nakashima Masato) as a Player 1 name. A small one-eyed woman will walk onscreen and shout "ま！".

Unused Text
A small copyright text string is hidden inside the ROM: COPYRIGHT 1990 OPR RYOUICHI OHKUBO