Save Our Dumb Planet
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 MedalsAchievements
expandAchievement  Goal  Bronze  Silver  Gold  Medals won 

Graphs of linear equations  Complete Levels 1 to 6  54,000  108,000  216,000  
Graphs of quadratic equations  Complete Levels 7 to 12  148,000  296,000  592,000  
Graphs of linear, quadratic & cubic equations  Complete Levels 13 to 18  231,000  462,000  924,000 
Instructions
expandGame Goals
The object of this math game is to protect Earth from meteors and other space hazards, by using your algebra skills to calculate accurate trajectories for Earth’s surfacetospace missiles.
Unfortunately, you are advised by poorlyeducated and argumentative scientists who recommend conflicting trajectory formulae. It is up to you to choose the best formula, and calculate y for x in order to plot waypoints and guide your missile towards its target.
Eliminate all threats and save humanity, using as few missiles as possible.
How To Play
As soon as a meteor is identified it appears on the missile defense screen, and three scientists will each recommend a formula to you. Your first task is to identify a formula that is true for the x and y coordinates of the meteor.
Select the correct formula by clicking on it, and then use that formula to plot two waypoints for the missile. Plot waypoints by positioning your mouse at the appropriate coordinates, and then clicking. The missile will then arm automatically and be ready to fire.
If you miss a meteor by choosing an incorrect trajectory or not positioning the waypoints accurately, the meteor will move closer to Earth before you have the chance to fire again.
Level Guide
Levels  Description  Required Actions 

The missile trajectories are described by increasinglycomplex linear formulae. 
Select a formula that is true for the x, y coordinates of the meteor Plot two waypoints for that formula. 

Obstacles appear in space – use quadratic formulae to 'bend' your missiles around them. 
Select a formula that is true for the x, y coordinates of the meteor, BUT does not pass through the obstacle. Plot two waypoints for that formula. 

12  As above, but this time there are three obstacles to avoid. 
Select a formula that is true for the x, y coordinates of the meteor, BUT does not pass through the obstacle. Plot two waypoints for that formula. 
Multiple meteors are approaching on a linear trajectory, but only one is a threat to the Earth. Locate it, then destroy it! 
Select the meteor that will collide with Earth. Select a trajectory that will strike the correct meteor. Plot two waypoints for that formula. 

The alien mothership appears! Use cubic formulae to slip your missiles past its defense systems. 
Select a formula that is true for the x, y coordinates of the alien ship. Plot two waypoints for that formula. 

18  The alien homeworld is revealed! The cowardly, terrified scientists are in disarray, so you must design a custom trajectory.  Adjust variables with the up/down arrows to create your own formula. 
Game Controls
You will have three opportunities to destroy each threat before it reaches the Earth.
Select a trajectory by clicking on it. If you change your mind about trajectories, you may simply click another trajectory to cancel the previous selection and any waypoints plotted.
Waypoints are plotted by clicking on a grid reference. They may be cleared by clicking on them a second time.
In Levels 13 and 14, three meteors appear at the same time, and each meteor is labeled with its own flight trajectory. You must first identify the meteor that represents a potential threat to Earth, and click it. Having selected the meteor, you must then go through the usual process of choosing a missile flight trajectory and plotting waypoints towards that meteor.
In Level 18, the terrified scientists are no longer willing to help and you must generate your own formula for the missile trajectory using the trajectory generator.
Operate the trajectory generator by clicking on the arrows to move the values up or down. You must create a formula that is true for both the Earth and the alien world.
Misslie Firing Sequence
The missile tracking system will report on the missile’s trajectory during flight and rate the accuracy of the plotted waypoints as 'Perfect!', 'Great', 'Okay' or 'Bad' in realtime.
If a missile is fired but the player has chosen an incorrect trajectory, then it will miss the meteor regardless of how well the waypoints have been plotted.
If a missile is fired on a correct trajectory but the waypoints have been incorrectly plotted, the missile will deviate from the anticipated trajectory and may miss the meteor altogether.
Scoring
Your overall score is the sum of the highest scores you achieved on each completed level. The formula for the score in a given level is:
 'Perfect!' waypoint score
 5,000 points
 'Great' waypoint score
 2,000 points
 'Okay' waypoint score
 1,000 points
 Time bonus
 5 points per second left on the clock
 Level multiplier
 Equivalent to the level’s number
 Missile factor

Hit meteor first time – 100%
Hit meteor second time – 50%
Hit meteor third time – 25%
For example: say you’ve just completed Level 4 (Level multiplier = 4). You hit the meteor with your second missile (Missile factor = 50%) and with 30 seconds left on the clock (Time bonus = 5 × 30 = 150 points). The missile passed through the first waypoint with a 'Perfect!' rating (Waypoint 1 score = 5000 points) and the second with an 'Okay' rating (Waypoint 2 score = 1000 points). Thus, your total score for the level would be: (5000 + 1000 + 150) × 4 × 0.5 = 12300 points.
So the rule for scoring high is simple: hit first, and hit fast!
Your performance at each level is recorded and retained.
Improve Your Score
expandChoosing the right equation
Earth is always on the curve of the correct formula, but may also be on the curve for other formulae. When trying to decide which equation to pick, try substituting the xcoordinate of the meteor into each equation. Then you will able to see if the ycoordinate produced by the equation matches that of the meteor. If they do, then that equation will fire a missile that will hit the meteor.
Remember to always follow the rules of PEMDAS when substituting values of x into the equations. For example: if y = 3x² + 6 and you are substituting x = 5, then you need to work out the value of y by first squaring x before you multiply by 3; in this example: y = 3 × 5² + 6 = 3 × 25 + 6 = 75 + 6 = 81.
For the harder levels, you will need to be able to multiply, add and subtract with negative numbers, i.e. you will need to know how to answer things like: − 5 × 7, 6 − (− 4), (− 4)².
Sometimes a calculation may give quite a big value and you should consider using an approximation to save time. If an approximation implies that a missile will pass close to the meteor then you have probably found the correct equation.
When trying to work out the ycoordinate that an equation gives, it is sometimes possible to tell if the answer will be positive or negative without actually working out values. Take y = 2x² + 3x + 10, for instance: if x = 2 then y will certainly be a positive number. If the meteor has a negative ycoordinate then you would be able to tell that this equation will not work. You can then try another equation.
When dealing with the early levels, if you know how to tell the slope of a line from its equation, then this can help you to choose the correct equation.
Plotting the Waypoints
To plot waypoints accurately you will need to substitute the value for the xcoordinate into the correct equation. To make the calculation easier you should choose the easiest value of x that lies between the Earth and the meteor. The easiest values to use (easiest listed first) are: x = 0, 1, 2, 5, (1), 3.
Obstacles
If your missile flies too close to an obstacle then the missile will explode and the meteor will not be destroyed. If there are lots of obstacles then you have to choose your equation even more carefully.Try substituting an xcoordinate of a point near the obstacles into your chosen equation. This will give you an idea of how close your missile will be to the obstacles.
Multiple Meteors
On levels that involve multiple meteors, you need to decide which meteor is on a collision path with Earth. Use the xcoordinate of the Earth and substitute this value into the equation that is shown for each meteor (you will be able to find this equation by rolling the cursor over the meteors). Once you have substituted the xcoordinate of the Earth into the meteor’s flight path equation you will be able to see if the ycoordinate matches with the Earth's.
Customized Equations
The final level requires you to create your own trajectory equation to destroy the alien’s homeworld. You should try to use a quadratic or cubic equation for the missile’s flight path. You will need to make use of the coordinate of the Earth as well as the coordinate of the alien home world.
The Earth is always positioned at x = 0, so you can use its ycoordinate to determine the yintercept of the equation. Now use the xcoordinate of the alien homeworld to determine a coefficient for x² or x³.
Good luck!
More Games
LeftMath Games
Try these short versions of our free math 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 skillsPlay Now more info...
Want to make it as a competitive balloonist? Well, your numeracy skills had better be good. Answer math 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
 Piñata Fever

Add and Subtract with Negative NumbersPlay Now more info...
Keep the party pumping in this fast n’ furious piñata smash‘emup! 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
 Sundae Times Lite

Basic Mental MathPlay Now more info...
Use your mental math skills to build the tallest, most incredible ice cream sundae possible! Play against the computer or headtohead versus other students from around the world.
Create the biggest ice cream sundae in the world with your mental math skills! Addition
 Subtraction
 Multiplication
 Division
 A Tangled Web

Angles, from basic rules to circle theoremsPlay Now more info...
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
 Wrecks Factor

Factor simple and harder quadratics, including quadratics with common factorsPlay Now more info...
S.O.S.! Ships navigating the treacherous Bermuda Rectangle are falling prey to bizarre disasters. Factor 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 factoring! Quadratics
 Factoring
 Difference of two squares
 Common factors
 Sundae Times

Times tables from ×2 up to ×15Play Now more info...
Use your knowledge of times tables to build the tallest, most incredible ice cream sundae possible! Play against the computer or headtohead 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 math
 Pyramid Panic Lite

Lengths, Perimeters and Areas of ShapesPlay Now more info...
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! Intermediate School focused
 Circles
 Perimeters
 Areas
 Sigma Prime Lite

Prime Factorization with Multiplication and DivisionPlay Now more info...
Use multiplication and division with primes and prime factorization to defeat the alien invasions. Make use of divisibility strategies to achieve higher scores and progress to the next challenge.
Defeat the alien invasions in a math game specially designed for elementarylevel students! Intermediate School focused
 Prime Factorization
 Exponents
 Multiplication
 Division
 Pemdas Blaster

P.E.M.D.A.S., The Order of OperationsPlay Now more info...
Professor PEMDAS' roborators have run amok and need to destroyed. Use your orderofoperations codecracking abilities and powerful weaponry to close these roborebels down.
Use PEMDAS to blast the Roborators into scrap metal! PEMDAS
 Exponents
 Roots
 Times tables
 Pemdas Blaster Lite

P.E.M.D.A.S., The Order of OperationsPlay Now more info...
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!
Fastpaced robot blasting action specially designed for elementarylevel students! Intermediate School focused
 Addition
 Subtraction
 Multiplication
 Division
 Flower Power Lite

Ordering Decimals, Fractions & PercentsPlay Now more info...
Grow flowers and harvest them to make money in this addictive order'emup. 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 elementary school students! Intermediate School focused
 Ordering
 Decimals
 Fractions
 Algebra Meltdown

Linear Equations and Number MachinesPlay Now more info...
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 math skills!
Solve linear equations in the ultimate nuclear test! Linear equations
 Using number machines
 One/multistage equations
 Sigma Prime

Prime Factorization with Multiplication and DivisionPlay Now more info...
Use multiplication and division with primes and prime factorization 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 factorization. Prime Factorization
 Exponents
 Multiplication
 Division
 Ice Ice Maybe

Fast Estimation with Basic Number CalculationsPlay Now more info...
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! Percents
 Addition
 Subtraction
 Multiplication
 Division
 Pyramid Panic

Basic Shapes to Advanced GeometryPlay Now more info...
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
 The Pythagorean Theorem
 Areas
 Perimeters
 Circumference
 Flower Power

Ordering Decimals, Fractions & PercentsPlay Now more info...
Grow flowers and harvest them to make money in this addictive order'emup. 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'emup! Ordering
 Decimals
 Fractions
 Percents
 TranStar

Reflections, Rotations, Dilations and TranslationsPlay Now more info...
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 dilate TranStar into the safety of the StarGate.
Apply transformations to guide a lost space entity back home! Reflections
 Rotations
 Dilations
 Translations
 Save Our Dumb Planet

Linear, Quadratic and Cubic EquationsPlay Now more info...
Defend Earth from deadly meteorites using the planetary missile defences. A team of dumb scientists are on hand to suggest possible trajectories and trashtalk. Quickly plot your waypoints or find a new planet!
Plot missile flight paths to blast the meteors! Linear eqns
 Quadratic eqns
 Cubic eqns
 Coordinates
 PEMDAS