Yoomurjak's Ring (Hungarian: Jumurdzsák gyűrűje) is an FMV (Full motion video-based) point-and-click adventure game by Private Moon Studios, designed by Hungarian game designer and musician Pierrot (Tamás Z. Marosi) in 2005.

An important objective of the game is to introduce the baroque Hungarian town of Eger through a first-person experience provided by nearly 800 panoramic photographs and film footage fit for an entire movie.

He decides to visit his mother's birthplace in Hungary and the picturesque town of Eger because he has read about it in an old Hungarian novel.

This book was one of his favorite childhood readings, titled ‘Eclipse of the Crescent Moon’,[3] written by a Hungarian author Géza Gárdonyi who also lived in Eger.

This is a real novel about the heroic past of Eger in the middle of the 16th century when the town was one of the ultimate strongholds against the Ottoman forces advancing.

[4] When Jonathan received that book from his great-grandfather he found two letters in it from a strange Hungarian scientist named Ábray, dated back in 1898.

The old man believes that the author modeled Yoomurjak, the Turkish character in the book, on his grandfather, who was actually the disappeared apprentice.

After breaking up with his girlfriend Allison, Jonathan aims to start an entirely new life in the peaceful town of Eger.

The main characters are played by prominent Hungarian celebrities: László Görög,[5] György Bárdy and in the gangster's role a popular rapper Ganxsta Zolee.

Most of the panoramic pictures are not static; the loop movements of the characters and extras make the exploration of the locations even more realistic.

Besides the mostly electronically scored mood-enhancing tracks, music also has a special role in the riddles of the game.

It is best known for its castle, thermal baths, historic buildings (including the northernmost Turkish minaret), and its red and white wines.

The observatory and the Camera Obscura (a large periscope) was installed in 1776, equipped with the most modern apparatuses of the time, based on the design of astronomer Maximilian (Miksa) Hell.

Between 1897 and 1922, he lived in this house, and here wrote many of his works, including one of his most beautiful historical novels, Stars of Eger.

The castle's defenders are said to have numbered fewer than 2,000, including women and children when they successfully held off a Turkish army of 80,000 soldiers in 1552 (the Siege of Eger).

Private Moon Studios was given the opportunity to create Yoomurjak's Ring by winning a competition.