Guided Class Project
Complete downloadable pilotReach a safe place while a huge, unreasonable pigeon chases you across the map. The game should be funny to play and precise enough to explain.
Finished-game summary
Guide the Player from the lower-left corner to the striped Safe Zone while a comically oversized pigeon closes in. The arrow keys change x and y, the explicit game state prevents conflicting endings, and R performs the same complete reset as the green flag.
Project system sketch
Letters A–F connect stage positions, movement, pursuit, collision priority, the Panic meter, and the state flow.
What you need
No installation is required where browser-based Scratch is available. Saving and sharing options depend on account and classroom setup; account creation is not assumed by this project.
Project downloads
Each download is generated from original repository sources and checked before it reaches this panel.
Original art, sounds, variables, known positions, and setup scripts—without the completed game systems.
Download Starter Project escape-from-the-giant-pigeon-starter.sb3The complete playable reference used by every code section on this page.
Download Finished Reference escape-from-the-giant-pigeon-finished.sb3Human-readable original SVG costumes, backdrop, WAV effects, sketch, README, and licence notes.
Download Art and Sound Pack escape-from-the-giant-pigeon-assets.zipSystems you will build
Build in order. Test each system before adding the next one.
Build system
Creates one reliable starting state for every run.
The flag asks for Reset Game. That receiver sets READY first, restores every variable, resets the timer, waits for every actor to reset, then begins PLAYING after a fair pause.
ON green flag:
ask the whole project to reset
ON Reset Game:
set READY and restore every value
reset every actor
wait for a fair start
set PLAYINGwhen green flag clicked broadcast [Reset Game v] and wait
when green flag clicked
broadcast [Reset Game v] and waitwhen I receive [Reset Game v] set [Game State v] to [READY] stop all sounds set [Panic v] to (0) set [Survival Time v] to (0) set [Pigeon Speed v] to (2) reset timer broadcast [Reset Actors v] and wait wait (1) seconds set [Game State v] to [PLAYING] play sound [start v] until done
when I receive [Reset Game v]
set [Game State v] to [READY]
stop all sounds
set [Panic v] to (0)
set [Survival Time v] to (0)
set [Pigeon Speed v] to (2)
reset timer
broadcast [Reset Actors v] and wait
wait (1) seconds
set [Game State v] to [PLAYING]
play sound [start v] until donewhen I receive [Reset Actors v] set rotation style [left-right v] go to x: (-190) y: (-110) switch costume to [normal v] show say []
when I receive [Reset Actors v]
set rotation style [left-right v]
go to x: (-190) y: (-110)
switch costume to [normal v]
show
say []when I receive [Reset Actors v] go to x: (190) y: (-115) switch costume to [inactive v] show
when I receive [Reset Actors v]
go to x: (190) y: (-115)
switch costume to [inactive v]
showBuild system
Reads all four arrow keys and changes one coordinate at a time.
Movement runs only in PLAYING. Right and left change x; up and down change y. Separate checks allow diagonal movement when two keys are held.
WHILE the game is playing:
read the arrow keys
change x for left or right
change y for up or downwhen green flag clicked
forever
if <(Game State) = [PLAYING]> then
if <key [right arrow v] pressed?> then
change x by (5)
end
if <key [left arrow v] pressed?> then
change x by (-5)
end
if <key [up arrow v] pressed?> then
change y by (5)
end
if <key [down arrow v] pressed?> then
change y by (-5)
end
end
end
when green flag clicked
forever
if <(Game State) = [PLAYING]> then
if <key [right arrow v] pressed?> then
change x by (5)
end
if <key [left arrow v] pressed?> then
change x by (-5)
end
if <key [up arrow v] pressed?> then
change y by (5)
end
if <key [down arrow v] pressed?> then
change y by (-5)
end
end
endBuild system
Clamps the Player to a readable rectangle inside the Scratch stage.
Four comparisons inspect the live x and y positions. If an edge is exceeded, the matching coordinate is set exactly to that edge.
FOREVER during PLAYING:
if x passes either side, put x on the edge
if y passes top or bottom, put y on the edgewhen green flag clicked
forever
if <(Game State) = [PLAYING]> then
if <(x position) > (218)> then
set x to (218)
end
if <(x position) < (-218)> then
set x to (-218)
end
if <(y position) > (158)> then
set y to (158)
end
if <(y position) < (-158)> then
set y to (-158)
end
end
end
when green flag clicked
forever
if <(Game State) = [PLAYING]> then
if <(x position) > (218)> then
set x to (218)
end
if <(x position) < (-218)> then
set x to (-218)
end
if <(y position) > (158)> then
set y to (158)
end
if <(y position) < (-158)> then
set y to (-158)
end
end
endBuild system
Restores the dramatic pigeon to a known, distant starting zone.
Reset Actors restores position, direction, costume, and visibility. The Stage remains in READY for one second before pursuit can run.
ON Reset Actors:
stop any old chase appearance
move far from the Player
face left, show wings up, and showwhen I receive [Reset Actors v] set rotation style [all around v] go to x: (155) y: (100) point in direction (-90) switch costume to [wings up v] show
when I receive [Reset Actors v]
set rotation style [all around v]
go to x: (155) y: (100)
point in direction (-90)
switch costume to [wings up v]
showBuild system
Uses one transparent pursuit rule: point toward the Player and move by Pigeon Speed.
The forever loop re-aims because the Player keeps moving. A short wait controls speed and makes the two wing costumes readable.
WHILE the game is PLAYING:
point toward the Player's current position
move by Pigeon Speed
flap once and pause brieflywhen green flag clicked
forever
if <(Game State) = [PLAYING]> then
point towards [Player v]
move (Pigeon Speed) steps
next costume
wait (0.08) seconds
end
end
when green flag clicked
forever
if <(Game State) = [PLAYING]> then
point towards [Player v]
move (Pigeon Speed) steps
next costume
wait (0.08) seconds
end
endBuild system
Changes the state to CAUGHT exactly once when the Player touches the Giant Pigeon.
The outer state check prevents repeated endings. State changes before the broadcast, so every other PLAYING system stops on its next check.
WHILE PLAYING:
if touching the Giant Pigeon:
set CAUGHT first
announce Caughtwhen green flag clicked
forever
if <(Game State) = [PLAYING]> then
if <touching [Giant Pigeon v]?> then
set [Game State v] to [CAUGHT]
broadcast [Caught v]
end
end
end
when green flag clicked
forever
if <(Game State) = [PLAYING]> then
if <touching [Giant Pigeon v]?> then
set [Game State v] to [CAUGHT]
broadcast [Caught v]
end
end
endBuild system
Awards SAFE only when the Player reaches the shelter without pigeon contact.
The not-touching-pigeon guard gives CAUGHT priority in an overlap that looks simultaneous. Only then does the script inspect the Safe Zone.
WHILE PLAYING:
if NOT touching the pigeon:
if touching the Safe Zone:
set SAFE first
announce Reached Safetywhen green flag clicked
forever
if <(Game State) = [PLAYING]> then
if <not <touching [Giant Pigeon v]?>> then
if <touching [Safe Zone v]?> then
set [Game State v] to [SAFE]
broadcast [Reached Safety v]
end
end
end
end
when green flag clicked
forever
if <(Game State) = [PLAYING]> then
if <not <touching [Giant Pigeon v]?>> then
if <touching [Safe Zone v]?> then
set [Game State v] to [SAFE]
broadcast [Reached Safety v]
end
end
end
endBuild system
Turns distance into a 0–100 Panic value and records survival time.
Nearby pigeons create higher Panic. Two boundary checks keep the meter sensible. A separate Stage script rounds the timer to tenths while PLAYING.
WHILE PLAYING:
Panic = 100 - rounded(distance / 4)
clamp Panic between 0 and 100
Survival Time = timer rounded to tenthswhen green flag clicked
forever
if <(Game State) = [PLAYING]> then
set [Panic v] to ((100) - (round ((distance to [Giant Pigeon v]) / (4))))
if <(Panic) < (0)> then
set [Panic v] to (0)
end
if <(Panic) > (100)> then
set [Panic v] to (100)
end
end
end
when green flag clicked
forever
if <(Game State) = [PLAYING]> then
set [Panic v] to ((100) - (round ((distance to [Giant Pigeon v]) / (4))))
if <(Panic) < (0)> then
set [Panic v] to (0)
end
if <(Panic) > (100)> then
set [Panic v] to (100)
end
end
endwhen green flag clicked
forever
if <(Game State) = [PLAYING]> then
set [Survival Time v] to ((round ((timer) * (10))) / (10))
end
end
when green flag clicked
forever
if <(Game State) = [PLAYING]> then
set [Survival Time v] to ((round ((timer) * (10))) / (10))
end
endBuild system
Shows one clear result using costume, sound, speech, and Safe Zone feedback.
Ending receivers do presentation work after the detector has committed the game state. Chase and movement stop because they are gated by PLAYING.
ON Caught:
show caught costume and sound
explain how to restart
ON Reached Safety:
activate the shelter and play its sound
explain how to restartwhen I receive [Caught v] switch costume to [caught v] play sound [caught v] until done say [CAUGHT! Press R to restart.]
when I receive [Caught v]
switch costume to [caught v]
play sound [caught v] until done
say [CAUGHT! Press R to restart.]when I receive [Reached Safety v] say [SAFE! Press R to restart.]
when I receive [Reached Safety v]
say [SAFE! Press R to restart.]when I receive [Reached Safety v] switch costume to [active v] play sound [safe v] until done
when I receive [Reached Safety v]
switch costume to [active v]
play sound [safe v] until doneBuild system
Routes the R key through the same complete Reset Game system as the flag.
There is one reset definition, so fixes apply to both start paths. R works after a win, after a loss, or during play.
ON R key:
ask for Reset Game and wait
THEN test green flag, win-restart, caught-restart, edges, overlap, and variableswhen [r v] key pressed broadcast [Reset Game v] and wait
when [r v] key pressed
broadcast [Reset Game v] and waitTest checklist
Do not call the project finished after one easy win.
Check all four boundary comparisons and confirm x rules set x while y rules set y.
Inspect both reset positions and make sure pursuit only runs while Game State equals PLAYING.
Keep the not-touching-pigeon guard around the Safe Zone check and set state before broadcasting the ending.
Every sprite needs a Reset Actors receiver that restores costume, visibility, and speech as well as position.
The formula subtracts scaled distance from 100; then two checks clamp the result to 0–100.
Improve the system
Change Pigeon Speed to 3, test three routes, and adjust one starting coordinate until the game remains fair.
Add sandwich crumbs that reduce Panic without changing Game State. Explain how each crumb can trigger only once.
Create a second original backdrop with a new Safe Zone location. Reset the stage number, actor positions, and collision rules without duplicating the whole game.
What to demonstrate
Explain one coordinate change, one state transition, one edge-case test, and one improvement you made.
Artwork and independence note
The sketch-style vectors, layout slots, and palette are production-ready placeholders for this pilot. A human illustrator can refine them later without changing sprite names, costume centres, scripts, downloads, or the reusable curriculum model.
Scratch is a project of the Scratch Foundation. School of Code is an independent educational project and is not affiliated with or endorsed by the Scratch Foundation.