Are you an educator? Visit our School Platform

What is cZeus?

cZeus characters Hector, Europa and friends

cZeus is the ultimate daily brain workout disguised as an addictive number puzzle. Designed for quick-burst mobile play, it turns smart logic into simple, satisfying grid challenges you can solve anywhere—in five minutes or less.

Whether you're sipping your morning coffee, commuting, or unwinding on the couch, cZeus gives your mind a refreshing cognitive workout without feeling like a math test.

Why You’ll Get Hooked

  • Sharpen Focus & Mental Speed: Keep your memory, logic, and mental math sharp with scientifically designed daily grid challenges.
  • Easy to Pick Up, Impossible to Put Down: Discover “Mystery Numbers” (1–9) using clear sum and product clues. Just four simple rules—zero formal algebra required.
  • Bite-Sized Mobile Play: Built for busy schedules. Jump in for a two-minute mental warm-up or settle in for an extended puzzle session.
  • Level Up & Customize: Join characters Hector and Europa to complete levels, earn rewards, and unlock unique avatars as your brain power grows.
  • Always Fair, Always Solvable: Every puzzle is hand-crafted with exact logic, guaranteeing one single, satisfying answer every time.

Find Your Brain’s Sweet Spot

  • Light Class: A guided 14-level warm-up to learn the rules effortlessly.
  • Mortal Class: A fun, casual tune-up to dust off your mental math and times tables.
  • Hero Class: Ramps up the strategy for players who love a good logic challenge.
  • DemiGod Class: High-intensity grids built for dedicated puzzle enthusiasts.
  • Olympian & Titan Classes: The peak experience—crafted specifically for grandmaster solvers and puzzle veterans.

Play Solo or Race Friends

Build your daily streak solo, or challenge friends to head-to-head multiplayer logic battles to see who has the fastest brain.

Principles

The aim of cZeus game is to find all the missing mystery numbers by using the given clues and the rules.

Mystery Numbers


These are the unknown numbers located in small square tiles.

Your mission is to reveal these by using clues and applying cZeus Rules.

In this example puzzle on a 2 by 2 grid, there are 4 mystery numbers.

However two of the mystery numbers, 1 & 2, are already given, and so only 2 mystery numbers remain to be solved.

cZeus Puzzles Mystery Numbers

Mystery Pairs


These are any two neighbouring Mystery Numbers, connected vertically or horizontally.

A mystery pair always has a unique set of addition and multiplication values.
cZeus Puzzles Mystery Numbers e.g. mystery pair 1 and 4 is horizontally connected
cZeus Puzzles Mystery Pairs e.g. mystery pair 4 and 4 is vertically connected
Remember: A mystery pair can be made of any two identical or non-identical numbers.

Pair Clues


These are shown in the rectangles in between Mystery Pairs.

There are two types of Pair Clues:
Add clues
Add clues are the sum of a mystery pair

e.g.cZeus pair cluescZeus Puzzles   means cZeus Puzzles cZeus pair clues cZeus Puzzles = cZeus Puzzles
cZeus Puzzles Pair Clues
A set of Pair Clues of a mystery pair is the combination of both its add and times clues.
Times clues
Times clues are the multiplication of a mystery pair

e.g. cZeus pair cluescZeus Puzzles means cZeus Puzzles cZeus pair clues cZeus Puzzles = cZeus Puzzles
Don't forget:
A Mystery Pair always has a unique set of Pair Clues.

So, a Mystery Pair can be identified from its respective set of Pair Clues.

Square Clues


These are given on the central square tile surrounded by four Mystery Number tiles.

There are two types of Square Clues:

e.g. cZeus pair cluescZeus Puzzles is a square add clue             cZeus Puzzles cZeus pair clues cZeus Puzzles cZeus pair clues cZeus Puzzles cZeus pair clues cZeus Puzzles = cZeus Puzzles

e.g. cZeus pair cluescZeus Puzzles is a square times clue            cZeus Puzzles cZeus pair clues cZeus Puzzles cZeus pair clues cZeus Puzzles cZeus pair clues cZeus Puzzles = cZeus Puzzles
cZeus Puzzles Mystery Numbers

Glossary

cZeused

cZeused

Complete a puzzle in the given amount of time, without making any errors, and you've cZeused it!



You can use hints to help you cZeus it! Hint icon


cZeused puzzles earn extra bonus points and extra coins


cZeus Square

This refers to when a mystery number repeats four times around a Square Clue




Remember: cZeus Square

occurs once or not at all in a puzzle

always has it's square-times-clue given


Find it quickly to score more points!




Mystery Numbers


These are the numbers located in small square tiles


Your mission is to reveal these unknown mystery numbers by using the clues and applying cZeus Rules




Mystery Pairs


These are any two neighbouring mystery numbers connected vertically or horizontally.


(1 & 4)
is a mystery pair		 (4 & 4)
is a mystery pair

Remember: a mystery pair
has a unique set of addition and multiplication values
can be made of any two identical or non-identical numbers


Pair Clues


These are given on the connecting tile of mystery pairs:

e.g.

add clues: 4        times clues: 16

add clue
4
means
1   3 = 4 		 pair clue
16
means
8   2 = 16 
  A set of Pair Clues for a mystery pair  

Remember: A mystery pair always has a
unique set of Pair Clues

So a mystery pair can be identified from its set of Pair Clues

Square Clues


These are given on the central-square-tiles surrounded by four mystery number tiles.


e.g.

10 is an square-add-clue

1 4  2 3  = 10

24 is an square-times-clue

1 4  2 3  = 24





Rules

Rule 1


Mystery numbers are whole numbers between 1 and 9. The same number can occur many times or not at all.
You are given few Pair Clues and Square Clues to identify these.

Rule 2


Mystery-pairs (whether horizontal or vertical) can occur only once in a puzzle. i.e. mystery pairs producing the same addition and multiplication values can’t be repeated.
cZeus Puzzles Mystery Numbers

Can have: 

Here there are two new Mystery pairs
& and &

So this is ok
cZeus Puzzles Mystery Numbers

Can't have: 

Here there are two repeating Mystery pairs
& and &

So this breaks Rule 2

Rule 3


cZeus-Square is an exception to Rule 2. The cZeus-Square can occur when a Mystery Number joins up with its-own identical number four times, and together they form a square.

cZeus Puzzles Rule 3

This is a cZeus Square.
It can occur once or not at all in a puzzle!
Aim to spot it quickly to score more points!

Rule 4


Each puzzle can only have one solution!

If you think you have
more than one solution
you have probably broken Rule 2.

How to Solve?

These videos may have older graphics as the game has been upgraded but the concept of solving the puzzles are same.

Mortal Class

Olympian Class

Sample Puzzles

Try out these sample cZeus puzzles of various sizes.

The sample puzzles are in Adobe PDF format. You will need Adobe Reader to open and print these sample files. Visit Adobe to install free Adobe Reader software.

3 by 4 cZeus Puzzles, Range 1 to 9


4 by 4 cZeus Puzzles, Range 1 to 9


3 by 4 cZeus Puzzles, Range 1 to 12


4 by 4 cZeus Puzzles, Range 1 to 12


5 by 5 cZeus Puzzles, Range 1 to 12


Play wherever you are

Download on the App Store

Choose your cZeus experience and start sharpening your number skills.

cZeus Maths Challenger app icon

cZeus Maths Challenger

Challenge your mental arithmetic across mobile and Alexa.

Download cZeus Maths Challenger on the App Store Get cZeus Maths Challenger on Google Play Use cZeus Maths Challenger with Alexa
Star Numbers app icon

Star Numbers

Build speed and confidence through quick number challenges.

Get Star Numbers on Google Play
Coming soon Daily Puzzles app icon

Daily Puzzles

Enjoy a fresh browser-based challenge every day.

Play Daily Puzzles in your browser

Social