Ayakashi no Shiro is a Japanese Game Boy title from 1990, published by SETA. The name translates roughly as Castle of Apparitions — in Japanese folklore, ayakashi are ghosts and supernatural phenomena, and shiro means castle. The title alone promises mysterious halls and the uncanny, material Japanese games have always handled with enthusiasm.

In 1990 the Game Boy was at the start of its run and its library was still taking shape. Japanese publishers were adapting everything imaginable to the small monochrome screen, and a large share of those early titles never left the domestic market — this one included. Western players simply never met an entire layer of early Game Boy output, and are only now discovering it in retrospect through archives.

The record notes a top-down view and a single player; beyond that the card carries little, and honesty is better than invention. SETA was an established Japanese company with a wide range, from sports to puzzle games, so a castle of apparitions could have taken many playable forms — without documentation, the details remain a question for veterans of the Japanese scene.

The title cannot be played in the browser at this time, and the local play counter is silent. At minimum the year, SETA's name and Game Boy shots are held on OldGame.cz, a small window into a poorly charted stretch of handheld history.