HyakuRenZan vs Practice

The brain training application which trains concentration, reaction power, and calculation power! The easy rule which calculates the number located in each line vertically and horizontally. You will Play every day and will heighten the "brain's ability"! --- How to play HyakuRenZan is a game which competes for the time located in each line vertically and horizontally to calculate arrangement numbers at random and fill the field of 10x10 (the easy mode is 5x5). Game mode can be chosen from three kinds, addition, subtraction, and multiplication. Difficulty has easiness,normal and hard. The easy mode will be completion if a number buries all of the field of 5x5 by a single figure. The normal mode will be completion if a number buries all of the field of 10x10 by a single figure. The hard mode will be completion if a number buries all of the field of 10x10 by double figures. --- Assessment system Five steps of evaluations are performed by Speed of calculation for every input. Since evaluation of "Excellent", "Great", "Good", "Fine", and "Bad" is performed in real time, it is followed as the guide of calculation speed. --- Visual records management The results for the 100 past are saved at game mode and given difficulty, and, in addition, the ranking by the 100th place of the past is also saved automatically. Record is displayed by the graph and can check change of calculation speed at a glance. --- GameCenter You can register results into GameCenter. Compete with the expert of HyakuRenZan in the world!

Mental arithmetic isn't something you learn once — it's something you build through repetition. This app gives you a near-infinite supply of problems, letting you practice until any calculation feels effortless. Train with targeted drills for addition, subtraction, multiplication, and division. Focus on the operations that trip you up most, and go from uncertain to fluent. Built-in difficulty presets mean you can open the app and start immediately — no setup required. When you're ready to fine-tune, full customization is available: toggle carrying for addition, borrowing for subtraction, and set the exact number ranges for multiplication and division to suit your current skill level. The interface supports both light and dark mode, so it's comfortable to use anytime, anywhere. Multi-language support removes any language barrier to practice.