Calculation Castle – Greco’s Ghostly Challenge Subtraction, also known as Greco Kara no Chousenjou! Keisan no Shiro to Obake-Tachi – Hikizan 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 subtraction 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 borrowing numbers with 2-digit math problems and more. Advancing through the levels, your child can naturally become able to solve 4-digit subtraction problems with ease.
