# Welcome to Opculato.com

This website is the home of the exciting Math Puzzle game called OPCULATO.

## What is OPCULATO?

OPCULATO is a type of math puzzles. There are several variations of OPCULATO, and they all share the same basic puzzle layout.

OPCULATO has been made available online as apps for Android and iOS since 2010, and has already become popular in United States, Japan, South Korea, Germany and many other countries. You may also know the puzzle from the many print and puzzle book releases. These include translated versions and easier versions for children.

We’re very excited to announce that a brand new version of OPCULATO has now been launched in July 2015! It’s available on Android and Kindle. An iOS version will be coming soon!

## OPCULATO Screenshots

These are some screenshots from the new version of the app for Android. They show the basic gameplay. It consists in placing mathematical operators in the puzzle. All the equations in the puzzle must be solved, and you are rewarded with up to three stars for a perfect solution. The puzzles are randomly generated and guaranteed solvable. The have only one unique solution each.

(Click to enlarge.)

## How to solve an OPCULATO puzzle

To solve an OPCULATO puzzle, you must insert math operators into the empty positions of the puzzle until all the equations are solved.

Simply drag the free math operators from the bottom of the screen into the empty places in the puzzle. If you drag an operator to a correct place, it will snap to it and you will get a cheer. If the operator is dragged to an incorrect place, it will not stick there but automatically move back. You can try as many times as you want. Make fewer mistakes to get a better ranking.

OPCULATO puzzles use only these four primary math operators + – * /. There may be one or more of each of these in each puzzle, so you must be able to add, subtract, multiply and divide in order to solve it.

### Order of Operations / Operator Precedence

A concept that some players find tricky is the Order of Operations or Operator Precedence. Mathematical expressions are normally evaluated from left to right, but some operators precede others. These must be evaluated first regardless of their position in the equation. Multiplication and division precede addition and subtraction, and must be evaluated first.

This means that in the following expression, 2 * 3 must be evaluated before 2 + 2. The result is 8. And not 12 as it would have been if we had solved it simply left to right without observing the operator precedence.
2 + 2 * 3

Similarly, the following expression gives 15, not 10.
2 – 4 / 2 + 3 * 5

Brackets can be used to clarify it:
2 – (4 / 2) + (3 * 5) =
2 – (2) + (15) =
15

In fact, earlier versions of OPCULATO used brackets (), [] and {} to enforce the same order of operations in every puzzle. In the new version we’ve removed the brackets. This allows for a greater variety of expressions.

### Positive and negative numbers

OPCULATO puzzles can contain both positive and negative numbers. This can be a bit tricky, so let’s refresh the rules:

• When dividing or multiplying a positive and a negative number, the result is a negative number.
8 / -2 = -4
• When dividing or multiplying two negative numbers, the result is a positive number.
-2 * -2 = 4
• Subtracting a negative number is the same as adding a positive one.
0 – -5 = 5

### Fractions

All visible numbers in an OPCULATO puzzle are whole numbers. However, in some cases it may help to understand fractions. For example, we could solve the following expression in two ways.
1 / 2 * 6

Either by first dividing one by two (1/2 = 0.5) and then multiplying by six.
Or by considering 1 / 2 as a fraction (½) and then multiplying that by six directly (6 * 1/2 = 6/2 = 3).

## Languages

The new version of OPCULATO supports the following languages:

• English
• Spanish
• Japanese
• French
• Chinese
• Vietnamese
• Italian
• Korean
• Danish
• Portuguese
• Dutch

You can help translate OPCULATO into more languages! Get the spreadsheet containing all the in-game text strings here:

Feel free to download and fill in your own language equivalents. Send us the copy, and we will make sure to include it in a future update of the game.

We would also like our GooglePlay store page translated into as many languages as possible, so if you’re up for it, the spreadsheet for that is available here.