What students learn
The campaign moves through one angle relationship per sector, starting with the simplest:
- Complementary angles add to 90°.
- Supplementary angles add to 180°.
- Vertical angles, across from each other where two lines cross, are equal.
- Parallel lines cut by a transversal: corresponding and alternate angles are equal, and co-interior (same-side interior) angles add to 180°.
Every puzzle names its relationship, so students connect the vocabulary to the picture each time.
How the game works
Each room shows a diagram with one known angle and one unknown. Students type the missing angle to break the room's lasers. Then comes the sneak: a top-down maze with guards and cameras. The camera cone is drawn from the angle the student just solved, so a correct answer is literally the shape of the danger zone. Students move with the arrow keys and hide in bushes to reach the exit.
- Campaign: five sectors, one relationship at a time.
- Challenge: endless, mixed relationships, for a high score.
- Practice: pick any mix of relationships, no timer.
A wrong answer in the campaign gets a second try with the clock paused, and the first question of each new type comes with a hint and a slower timer. Short "Field Notes" explain where each relationship shows up in the real world.
Worked examples
Complementary: one angle is 34°. Find its partner.
90 - 34 = 56°
Supplementary: two angles on a straight line, one is 118°.
180 - 118 = 62°
Parallel lines: a transversal makes a 65° angle. Find the co-interior angle.
Co-interior angles add to 180°: 180 - 65 = 115° Alternate interior angle: 65° (equal)
Common mistakes
Using 180 for a complementary pair (or 90 for a supplementary one). Have students look for the right-angle box: if it's there, the pair adds to 90.
Assuming vertical angles add to 180°. Vertical angles are equal; it's the adjacent angles next to them that add to 180°.
Mixing up co-interior and alternate angles. Alternate angles are on opposite sides of the transversal and are equal; co-interior angles are on the same side and add to 180°.
Ways to use it in class
- Printables. A free worksheet with an answer key and a two-to-a-page exit ticket match this game, ready to print or save as a PDF.
- One sector per day. Teach a relationship, then play just that sector.
- Targeted practice. Students who miss vertical angles on a quiz play Practice with only that relationship.
- Sketch the room. Students draw one puzzle diagram and label every angle they can find, not just the one asked.
- Exit ticket. "Two parallel lines are cut by a transversal. One angle is 72°. Label all eight angles."
Discussion questions
- Why do you only need to know one angle to find all eight when a transversal crosses two parallel lines?
- Can two complementary angles both be obtuse? Explain.
- How would the camera cone change if your answer were 10° too big?
Real-world connections
Camera and floodlight coverage, road intersections, railroad crossings, and the crossing beams of bridges and ladders all depend on these relationships. Carpenters use supplementary angles every time they cut two boards to meet in a straight line.
Standards
CCSS.MATH.CONTENT.7.G.B.5Use facts about supplementary, complementary, vertical, and adjacent angles in a multi-step problem to write and solve simple equations for an unknown angle in a figure.
CCSS.MATH.CONTENT.8.G.A.5Use informal arguments to establish facts about the angles created when parallel lines are cut by a transversal. (Parallel-lines sectors)
Access and privacy
No accounts, no data collected. Plays with the keyboard alone, or with an on-screen joystick and number pad on a tablet.