Repeat count
Do an action a known number of times.
Curriculum topic
Loops and Repetition
A loop asks a program to repeat useful work without copying the same instruction again and again.
Why it matters
A small idea that returns in larger systems.
Games constantly redraw motion, check collisions, create waves, and update timers. Robots repeatedly read sensors and correct movement. Loops make that repetition visible, controllable, and easier to change.
Real-world connection
A lighthouse repeats a pattern, a traffic signal cycles through states, and a patrol checks the same route. Repetition becomes useful when the system also knows when to change or stop.
The connection shows where the idea returns; it does not claim every advanced application is taught in this first topic.
Math and logic kernel
The structure beneath the project.
Forever
Continue while the program is running.
Repeat until
Stop when a condition becomes true.
Iteration
One pass through the repeated instructions.
Small examples
Make one relationship visible at a time.
Snowball wave
Create repeated hazards with controlled timing.
Animation cycle
Repeat costume and position changes.
Robot patrol
Repeat movement while checking for an obstacle.
Countdown
Update a value once per timed interval.
Program connections
Where this topic appears.
Active now
Scratch & Game Design
Beginner-friendly programming through original games, animations, simulations, and interactive stories.
Active now
Robotics
Commands, sensors, simple electronics, simulations, and physical systems organized around Sense, Decide, Act.
Available later
Roblox Studio / Lua
A future bridge from visual programming to Lua, 3D objects, events, and larger game systems.
Common mistakes
Useful clues, not reasons to stop.
Accidental forever loop
The program never reaches the instructions after the loop.
No changing value
A repeat-until condition can never become true.
Copying instead of looping
Many identical blocks make one change tedious and error-prone.
Repeating too quickly
The result is unreadable because timing was never considered.
Lesson and projects
Use the idea inside a working system.
Scratch & Game Design
Guided Class Project
Attack of the Angry Snowballs
Build a falling-object defense game with repeated waves, score, timing, and increasingly unreasonable weather.
Open project
Robotics
Computer Lab Project
Robot Patrol Challenge
Design a patrol that repeats, senses a changed world, and uses feedback to recover.
Open project
Scratch & Game Design
Guided Class Project
The Floor Is Definitely Lava
Build a compact platform game where collision, jumping, safe surfaces, and game state must agree.
Open project