Calculation Castle – Greco’s Ghostly Challenge Addition, also known as Greco Kara no Chousenjou! Keisan no Shiro to Obake-Tachi – Tashizan 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. 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 addition problems and math drills learned at the elementary level. There are up to 10 steps of learning, starting with Elementary 1st grade level 1-digit math problems to developing skills such as carrying over numbers with 2-digit math problems and more. Advancing through the levels, your child can naturally become able to solve 4-digit 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.
