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## Rullo

Rullo is a simple math puzzle where you have a board full of numbers. The goal is to make the sum of numbers in each row and column be equal to the answer in the box. What you have to do is to remove some numbers from the equation by clicking on them. It sounds simple but requires a lot of thinking.

The board sizes range from 5×5 to 8×8. There are also 3 levels of difficulty: 1-9, 2-4, and 1-19. 1-9 means the numbers to calculate will range from 1 to 9.

There are 2 game modes: Classic and Endless. In Classic mode you can choose which board size and difficulty you want to play. In Endless mode you will be given a puzzle with random size and difficulty. Your total wins in any mode will be recorded. The puzzle is randomly generated so you’ll never get bored of playing.

The iOS and Android versions are now available and have more features!
iOS: https://itunes.apple.com/us/app/rullo/id1200714079?mt=8

## Reviews

I like the simple design, the overall idea, and specially how relaxing this game is.

Despite that, even though each puzzle is randomly generated, since gameplay relies on applying the same solving algorithms over and over, this gets boring rather quikly. Solving algorithms can fail if a puzzle has more than a single solution, which instead of making it more challenging, just makes it more frustrating.

For more compelling gameplay, a few things could be twiched, such as:

* Unlocking new difficulty levels instead of having all of them unlocked from start (for a sense of accomplishment);

* Have other shapes instead of just squares (rectangles, yes, but possibly also hexagons or equilateral triangles);

* Negative numbers (or perhaps a level for which by ticking/unticking a number one turns it positive or negative);

* I don't know how mathematically tractable it would be to do so, but have each puzzle have a single solution (this seems to be a NP problem, but I'm not sure);

* etc.

Anyway, those are a few suggestions off the top of my head. Your game is already quite good as it is. :)

Needs a function with which you can "lock" numbers, to remind yourself that those numbers should not be deactivated

It really felt as if I was sharpening my mind.

I love this game. Simple but addictive. I'm sure it's very good for my brain!
For the commenters who wanted a mobile version, your wish was fulfilled: there is now a mobile version for iOS and Android.
I would say it would be very good to be able to sync our progress on different devices.

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Score
4.06 / 5.00