Calculate Drill is a free Android application developed by darkdrive.net in the category of Education & Reference. This game aims to activate the brain by performing simple everyday calculations. It supports both Japanese and English languages, and offers three levels of difficulty to match the abilities of every user.

The game features 16 drills in each level, with each drill consisting of 20 questions. The levels are categorized as Easy, Normal, and Hard. The operator determines the difficulty level by selecting the number of digits, and the number of problems changes every time the same drill is played. This offers a fresh feeling in every drill.

Calculate Drill is an excellent game for those who want to improve their calculation skills and enhance their brain activity. It's perfect for individuals who want to keep their brain active and alert, especially for those who prefer to do simple calculations before sleeping. It's also suitable for children who are just beginning to learn arithmetic.

Overall, Calculate Drill is a fantastic application that offers a challenging and fun way to improve brain activity. It's user-friendly, easy to navigate, and provides an excellent way to test your calculation skills.