Sumaru Castle

Sumaru Castle (珠閒瑠城) is the dungeon found in Persona 2: Eternal Punishment. It is shaped like an old-fashion.

Story
According to the in-game legend (rumor manipulated by Nyarlathotep actually), Sumaru Castle was burned down to the ground during the conflict between Kiyotada Sumaru, Tatsunoshin Suou, Maihime Amano and Junnosuke Kuroda in Warring States.

In the actual event of the game, when Tofihune, the gigantic spaceship underneath Sumaru City, lifts the whole city into the sky, Sumaru Castle emerges from the underground of Honmaru Park where Kiyotada Sumaru's mummy (head only) was found decades ago. Tatsuzou Sudou with his New World Order executives arrives at the Utena (roof terrace) of the castle to begin the dragon ritual in order to release the Kegaru to enrage the dragons underground to ascend, causing.

A puzzle related to the (Ursa Major) is blocking player to access the Utena. It requires the player to collect the letters from the 7 lithographs scattered on different floors of the castle. Combining the 7 characters correctly according to order of the lithographs which represented by the stars of the Big Dipper will result in a mythological figure's name to access the locked door on 2/F.

The figure differs between Japanese and English versions. In the Japanese version, it is Sonjōō (ソンジョウオウ / 尊星王, lit. "Lord of the Respectful Star"), the alternative name of, the Buddhist Bodhisattva. He is related to this puzzle because Sonjōō represents Polaris. The English version replaced it with, the Greek hero who has slain Medusa. Perseus was picked for this placement probably due to {{w|{Perseus (constellation)|his constellation}} is located in the northern sky, which the Big Dipper is commonly known as the "Seven Stars of the North Dipper" in Taoism. Either way, Katsuya Suou finds it ironic the puzzle correlates figures from different religions or mythologies.

If the player have completed the prerequisites to obtain the ancestral Personas of Tatsunoshin Suou, Maihime Amano and Junnosuke Kuroda, Maihime will be found on 3/F and the latter two on 7/F. They will give player access in the form of Persona to be summoned in Velvet Room, without the need of Material Card, which is usually required to summon special Personas.