Calculation Castle – Greco’s Ghostly Challenge Division, also known as Greco Kara no Chousenjou! Keisan no Shiro to Obake-Tachi – Warizan in Japan is an Edutainment game developed and published by Media5 for the Nintendo 3DS. It was released exclusively in Japan on August 21, 2013. Finally, a game that lets your child enjoy studying while challenging their skills in math has entered the world of gaming.
It contains a collection of division problems and math drills learned at the elementary level. There are up to 10 steps of learning, starting from problems using times tables within the Elementary 3rd grade level range to developing skills such as calculating the remainders of 2-digit division problems and more. Advancing through the levels, your child can naturally become able to solve 3-digit by 2-digit division problems with ease.
If you find a ROM that's encrypted, you need to use the Batch CIA 3DS Decryptor, created by Matif.
Not all games are fully compatible with Citra. If you do find a game that's not working, try using the latest PabloMK7 Citra fork, the continuation of Citra since its shutdown.
