Calcu100 is the quick Calculation game. Let's strengthen your count ability. Casting voice: Hatsune Miku, Megurine Luka (VOCALOID). If you answer all question matchings correctly, you will be able to play Hard mode. [How to play]. 1. Selectthe symbol of formula and quantitity, 2. Tap the start buttun and the game will start. 3. Choose the answer from the four candidates.