This is a brand new logical puzzle app that has been created by Japanese puzzle designers in collaboration with specialist mathematics and science schools.
It has been designed to increase your imagination and thinking abilities to the max!

This puzzle features a maze of calculations and the aim is to calculate the unknown area or length as shown by the question mark by using the other measurements which are provided.
As there are no decimals or fractions involved, the player only needs an elementary school level of mathematics to have a go; specifically, knowing how to determine the area of a rectangle (length × width = area).

Sounds simple enough, right?
Well, have a go at finding out the correct answer which the creators have hidden within each of the levels!
Even if you come across a level that looks difficult, by sharpening your thinking skills you will surely be able to solve it.
And there is nothing like that feeling of accomplishment when you finally solve that difficult puzzle!

In order to prevent puzzles from being solved just by looking at the diagram without performing any calculations, the scale of some of the puzzle diagrams has been adjusted to differ from the actual length or area.

Clear the number of levels shown to unlock more puzzles!

A new puzzle level will be added each day if you meet the conditions.

・You have completed the beginner and intermediate puzzles.
・You have also completed the new puzzle.
・A new puzzle will be added once per day when you start the app.
However, you will not receive all the new levels for previous days in which you didn’t start the app.

What's New

Version 1.2

Bug fixed
1.Missing texts displayed
2.Progress data saved

Ratings and Reviews



When you play, it says wise man, I'm a female

Great idea, abysmal app!


The concept is fantastic, as expected from Naoki Inaba, creator of Sudoku.

However, the app itself is atrocious:

1) tiny, tiny squares on the level selection screen. Half the screen is blank. Make them bigger! On an iPhone, it's incredibly fiddly!

2) asking, (when you manage to select a level) whether you want to 'Try this'. Seeing as at the level selection screen you can only choose the next uncompleted level, or previously completed levels, this is a pointless question - just let us play the level!

3) the answer book - showing the solution after finishing the puzzle and having to tap through each stage of the solution is tedious. Certainly in the early levels many will know what the solution is. Offer a choice in a settings menu to turn this on or off.

4) ads after EVERY puzzle! In the early levels, I'm completing them in less than 10 seconds. Then having to go through the bloody answer book and then have to dismiss an ad means I'm spending more time on the ads and tapping than actually playing the game! And to top it all, there are banner ads on the selection screen and in game too! The odd ad on occasion, fine. Not after every puzzle and over every screen. Stop being so greedy!

All-in-all, this is a horrendous app and I'll be deleting it. As for paying for the full app, you can forget that noise. No way in hell!

Great game shame about the ads


An enjoyable puzzle game however the 5sec ads after every puzzle are just annoying. Spent more time watching the ads than solving puzzles.

Is there an ad free version?


Happymeal Inc.
120.5 MB
Requires iOS 5.1.1 or later. Compatible with iPhone, iPad and iPod touch.
Age Rating
Rated 4+
© Happymeal Inc.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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