Sigma Prime

Get a free trial now!

Teachers, create your own FREE account at Mangahigh. Students will be able to save their scores, earn medals and access Prodigi.

Create School Student will be able to earn Silver and Bronze Medals

Achievements

expand  
Achievement Goal Bronze Silver Gold Medals won
Prime factorisation Finish a game 40,000 120,000 400,000  
Click and Drag

Instructions

expand  
Game Goals

In this maths game your goal is to protect the remote moonbase Sigma Prime from marauding alien invaders.

The game tests your skill at splitting numbers into the product of their prime factors. By firing prime numbers at the aliens you must reduce their values to 1 and destroy them!

The alien assault is merciless and relentless – how long can you survive?

How To Play

The alien invaders appear randomly at the top of the play area and home in on Sigma Prime.

Each alien displays a number value – by firing prime number missiles at the alien, your aim is to divide its value down to 1 and so destroy it! But take care, you must only hit an alien with its prime factors.

If an alien makes it through your defences or you hit an alien with a prime that is not a factor, ‘Remainder Rubble’ will rain down.

As Remainder Rubble accumulates at the bottom of the screen, it pushes Sigma Prime closer and closer to the lethal Laser Wire at the top of the screen – one touch of this deadly barrier spells disaster, and ends the game!

Stay alert for surprise appearances by alien Motherships. These giant vessels glide across the top of the play area and are worth big points if you manage to bring them down!

The aliens attack in waves. As the waves progress, the aliens become faster and tougher to destroy. Fortunately, after each wave, any Remainder Rubble is cleared from play so you always start a new wave back on the ground.

Sigma Prime features 22 unique attack waves. Before a game begins, you have the option to start play from any wave reached previously – though note that skipping the earlier waves will reduce your score and make medals harder to earn! If you beat all 22 waves, the game will ‘loop’ back to the start – but now with the aliens faster than before!

Game Controls

Guide the target crosshair with your mouse. Launch a prime number missile by pressing the appropriate arrow key on your keyboard.

If the game is in Window mode, you can also use the A, W and D keys to launch primes.

The primes available and their corresponding arrow keys are shown in the display at the bottom-right of the play area. The primes change from wave to wave – sometimes you even have three primes to launch! – so be sure to check this display each time a new wave starts.

When you destroy an alien with a value consisting of two or more prime numbers, the corresponding factor tree appears in the ‘Analysis’ column on the right of the play area so you can see exactly how you brought the alien down!

Scoring

The scoring increases as you progress from one wave to next:

Points per correct hit
25× wave number
Points per alien destroyed
50× wave number
Points per Mothership destroyed
1,000× wave number

At the end of each wave, you receive a bonus. The bonus is proportional to how far Sigma Prime has been pushed up the screen by Remainder Rubble, and is also multiplied by the wave number.

'End of wave' bonus points = 1000 × (percentage distance from Laser Wire) × (wave number)

So, if Sigma Prime ends a wave at ground level (i.e. it has not been pushed up the screen at all), you get the full bonus. However, if Sigma Prime ends a wave pushed halfway up the screen, you get half the bonus. And if Sigma Prime ends a wave almost touching the Laser Wire, you get next to no bonus at all!

Click and Drag

Improve Your Score

expand  
Basic Strategies
  • When a new wave starts, familarise yourself with which primes correspond to which buttons as quickly as possible.
  • Try to destroy aliens as quickly as you can after they appear – if you let the alien hordes build up, you can get overwhelmed quickly.
  • Remember: you don’t need to destroy the Motherships to complete a wave. Although they’re worth big points, if you’re struggling it’s better to focus on the aliens.
  • Learn basic divisibility tricks to get in some early hits, reducing your alien enemies to more manageable quantities.
  • When an alien appears, if its number is small enough then try to work out all of its prime factors and destroy it with a quick salvo of shots. For example, if an alien appears with 25 on it then fire off two 5s in quick succession – this will destroy it because 25 = 5 × 5.
  • Similarly, learn standard finishes – for example, 2, 2, 3 will finish off a 12 because 2 × 2 × 3 = 12
  • Aliens attack at different speeds so take this into account when deciding which ones to target and exactly when to fire.
Maths Strategies
  • Even numbers end in 0, 2, 4, 6 or 8. They are divisible by 2.
  • Numbers that end in 0 or 5 have 5 as a prime factor.
  • If a number ends in 0 then its divisible by 10 so hit it with a 2, 5 salvo.
  • If a numbers ends in 00 then its divisible by 100 so hit it with a 2, 5, 2, 5 salvo.
  • If the sum of the digits of a number is a multiple of 3 then the number itself is divisible by 3.
  • If the sum of the digits of a number is divisible by 9 then the number itself is divisible by 9.
  • Learn the squares of the prime numbers in the game: 2² = 4, 3² = 9, 5² = 25, 7² = 49, 11² = 121
  • Learn the cubes of some of the prime numbers: 2³ = 8, 3³ = 27, 5³ = 125, 7³ = 343
  • Any number in this sequence can be destroyed by 2s only: 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096,…
  • And any number in this sequence can be destroyed by 3s only: 3, 9, 27, 81, 243, 729,…
Click and Drag

More Games

Left

Maths Games

Try these short versions of our free maths games. Your students can play full length versions for free when you create a school account and issue them with logins.

Jetstream Riders
Times Tables and numeracy skills

Want to make it as a competitive balloonist? Well, your numeracy skills had better be good. Answer maths questions to make your balloon rise, and navigate tricky obstacles in this addictive multiplayer physics game.

Use your numeracy skills to beat the other balloonists and unlock daring new levels!
  • Addition
  • Subtraction
  • Times Tables
  • Division
Play Now more info...
Piñata Fever
Add and Subtract with Negative Numbers

Keep the party pumping in this fast n’ furious piñata smash-‘em-up! Move along the number line to intercept the descending piñatas, and then whack them for candy. Come on, catch the fever!

Add and subtract negative numbers to smash the piñatas and keep the party pumping!
  • Addition
  • Subtraction
  • Number line
  • Negative numbers
Play Now more info...
Sundae Times Lite
Basic Mental Maths

Use your mental maths skills to build the tallest, most incredible ice cream sundae possible! Play against the computer or head-to-head versus other students from around the world.

Create the biggest ice cream sundae in the world with your mental maths skills!
  • Addition
  • Subtraction
  • Multiplication
  • Division
Play Now more info...
A Tangled Web
Angles, from basic rules to circle theorems

Help Itzi the spider climb the clock to rescue his family! Solve cunning angle puzzles to reveal a path through each level’s maze of tangled webs and reach the goal. It’s sure to make your head spin!

Solve cunning angle puzzles and guide Itzi the robotic spider to the goal!
  • Basic angle rules
  • Parallel lines
  • Polygons
  • Circle theorems
Play Now more info...
Wrecks Factor
Factorise simple and harder quadratics, including quadratics with common factors

S.O.S.! Ships navigating the treacherous Bermuda Rectangle are falling prey to bizarre disasters. Factorise quadratic expressions to answer the ships’ distress calls and save their stricken crews!

Save the crews of the sinking ships with your powers of quadratic factorisation!
  • Quadratics
  • Factorising
  • Difference of two squares
  • Common factors
Play Now more info...
Sundae Times
Times tables from ×2 up to ×15

Use your knowledge of times tables to build the tallest, most incredible ice cream sundae possible! Play against the computer or head-to-head versus other students from around the world.

Use times tables to build the tallest, most incredible ice cream sundae possible!
  • Times tables
  • Number bonds
  • Multiplication facts
  • Mental maths
Play Now more info...
Pyramid Panic Lite
Lengths, Perimeters and Areas of Shapes

Help, you've been mummified! Use your geometry skills to build a path and escape from the pyramid, staying ahead of the mongrel demon Ammit. Battle skull bats and skeleton thieves with your magical ankh cross.

Use your shape skills to escape the mysterious pyramid!
  • KS2-focused
  • Circles
  • Perimeters
  • Areas
Play Now more info...
Sigma Prime Lite
Prime Factorisation with Multiplication and Division

Use multiplication and division with primes and prime factorisation to defeat the alien invasions. Make use of divisibility strategies to achieve higher scores and progress to the next challenge.

Escape from the Pyramid by solving geometry problems, specially designed for 7-11 students.
  • KS2-focused
  • Prime Factorisation
  • Indices
  • Multiplication
  • Division
Play Now more info...
Bidmas Blaster
B.I.D.M.A.S., The Order of Operations

Professor BIDMAS' roborators have run amok and need to destroyed. Use your order-of-operations code-cracking abilities and powerful weaponry to close these robo-rebels down.

Use BIDMAS to blast the Roborators into scrap metal!
  • BIDMAS
  • Indices
  • Roots
  • Times tables
Play Now more info...
Bidmas Blaster Lite
B.I.D.M.A.S., The Order of Operations

Apply your knowledge of the four operations (addition, subtraction, multiplication, division) to crack the attacking Roborator's shield codes and then blast them into scrap metal!

Fast-paced robot blasting action specially designed for for 7-11 students!
  • KS2-focused
  • Addition
  • Subtraction
  • Multiplication
  • Division
Play Now more info...
Flower Power Lite
Ordering Decimals, Fractions & Percentages

Grow flowers and harvest them to make money in this addictive order-'em-up. It may look simple but it's fractionally harder than you might imagine. Remember to wait for the bee!

Grow a beautiful flower garden in this game specially designed for 7-11 students!
  • KS2-focused
  • Ordering
  • Decimals
  • Fractions
Play Now more info...
Algebra Meltdown
Linear Equations and Number Machines

Solve linear equations to guide atoms through the reactor. But don't keep the scientists waiting too long or they blow their tops! It's the ultimate nuclear test of your maths skills!

Solve linear equations in the ultimate nuclear test!
  • Linear equations
  • Using number machines
  • One/multi-stage equations
Play Now more info...
Sigma Prime
Prime Factorisation with Multiplication and Division

Use multiplication and division with primes and prime factorisation to defeat the alien invasions. Make use of divisibility strategies to achieve higher scores and progress to the next challenge.

Defeat the alien invasions using primes and prime factorisation.
  • Prime Factorisation
  • Indices
  • Multiplication
  • Division
Play Now more info...
Ice Ice Maybe
Fast Estimation with Basic Number Calculations

Help penguins migrate across a perilous ocean patrolled by hungry killer whales. Use your estimation and approximation skills to position floating icebergs and bounce the penguins safely from glacier to glacier.

Estimate and bounce the penguins to their holiday haven!
  • Percentages
  • Addition
  • Subtraction
  • Multiplication
  • Division
Play Now more info...
Pyramid Panic
Basic Shapes to Advanced Geometry

Help, you've been mummified. Use your geometry skills to build a path across the voids, and escape from the pyramid, staying ahead of the mongrel demon Ammit. Battle skull bats and skeleton thieves with your ankh cross.

Call upon your geometry skills to escape evil Ammit!
  • Trigonometry
  • Pythagoras
  • Areas
  • Perimeters
  • Circumference
Play Now more info...
Flower Power
Ordering Decimals, Fractions & Percentages

Grow flowers and harvest them to make money in this addictive order-'em-up. It may look simple but it's fractionally harder than you might imagine. Remember to wait for the bee!

Order the buds in this bloomin' brilliant flower-'em-up!
  • Ordering
  • Decimals
  • Fractions
  • Percentages
Play Now more info...
TranStar
Reflections, Rotations, Enlargements and Translations

Guide TranStar through the perilous voids of space in search of a new home. Call upon the power of exotic space transformation phenomena to reflect, rotate, translate and enlarge TranStar into the safety of the StarGate.

Apply transformations to guide a lost space entity back home!
  • Reflections
  • Rotations
  • Enlargements
  • Translations
Play Now more info...
Save Our Dumb Planet
Linear, Quadratic and Cubic Equations

Defend Earth from deadly meteorites using the planetary missile defences. A team of dumb scientists are on hand to suggest possible trajectories and trash-talk. Quickly plot your waypoints or find a new planet!

Plot missile flight paths to blast the meteors!
  • Linear eqns
  • Quadratic eqns
  • Cubic eqns
  • Coordinates
  • BIDMAS
Play Now more info...
Right