Submit Relay Runner

Worked example

For a repeated route test, keep controls and start position fixed. A table of attempts helps distinguish a consistently hard landing from a one-time input mistake. Scaffold C-PLATFORM — A gravity-and-jump platform player Setup: CharacterBody2D root Player, child CollisionShape2D RectangleShape2D size (24,32), no scale changes. Layer 1 mask 2. StaticBody2D floor layer 2 mask 1 with rectangular collider. Add Input Map move_left, move_right and jump bound to Space. Place player above floor, not intersecting it. Coordinates use positive y downward. Attach script to Player. ```gdscript extends CharacterBody2D @export var speed: float = 160.0 @export var gravity: float = 900.0 @export var jump_speed: float = 340.0 func _draw() -> void: draw_rect(Rect2(-12, -16, 24, 32), Color.SKY_BLUE) draw_line(Vector2(-8, -4), Vector2(8, -4), Color.BLACK, 2.0) func _physics_process(delta: float) -> void: velocity.x = Input.get_axis("move_left", "move_right") * speed if not is_on_floor(): velocity.y += gravity * delta if Input.is_action_just_pressed("jump") and is_on_floor(): velocity.y = -jump_speed move_and_slide() ``` Scaffold C-CHECKPOINT — A safe checkpoint respawn Setup: Add this pattern to a separate Node2D level root with child Player using C-PLATFORM. Call set_checkpoint with a safe global position when a player reaches a checkpoint Area2D; call respawn when entering a fall zone. This code does not connect Area2D automatically; select the area body_entered signal in editor and call these methods from its handler after checking the player group. Respawn is deferred because a physics callback may be active. ```gdscript extends Node2D @onready var player: CharacterBody2D = $Player var checkpoint: Vector2 func _ready() -> void: checkpoint = player.global_position func set_checkpoint(safe_position: Vector2) -> void: checkpoint = safe_position func respawn() -> void: _apply_respawn.call_deferred() func _apply_respawn() -> void: player.global_position = checkpoint player.velocity = Vector2.ZERO ```

A gravity-and-jump platform player

GDScript (Godot 4, not Scratch, Python, JavaScript or C#). Scaffold C-PLATFORM. Copy starts from this text. The desk does not run it.

Scene and node setup

CharacterBody2D root Player, child CollisionShape2D RectangleShape2D size (24,32), no scale changes. Layer 1 mask 2. StaticBody2D floor layer 2 mask 1 with rectangular collider. Add Input Map move_left, move_right and jump bound to Space. Place player above floor, not intersecting it. Coordinates use positive y downward. Attach script to Player.

extends CharacterBody2D
@export var speed: float = 160.0
@export var gravity: float = 900.0
@export var jump_speed: float = 340.0
func _draw() -> void:
    draw_rect(Rect2(-12, -16, 24, 32), Color.SKY_BLUE)
    draw_line(Vector2(-8, -4), Vector2(8, -4), Color.BLACK, 2.0)
func _physics_process(delta: float) -> void:
    velocity.x = Input.get_axis("move_left", "move_right") * speed
    if not is_on_floor():
        velocity.y += gravity * delta
    if Input.is_action_just_pressed("jump") and is_on_floor():
        velocity.y = -jump_speed
    move_and_slide()

Checks to run in the editor

• Player lands without sinking.
• Holding jump does not repeatedly jump in air.
• Do not multiply the whole velocity by delta before move_and_slide.

Native Godot 4.7.2.stable.official.ed1daf0bf headless compile and representative node-tree/runtime tests passed; see native-qa-results.json. Visual UI, audible output, exports and website submission still need separate checks.

A safe checkpoint respawn

GDScript (Godot 4, not Scratch, Python, JavaScript or C#). Scaffold C-CHECKPOINT. Copy starts from this text. The desk does not run it.

Scene and node setup

Add this pattern to a separate Node2D level root with child Player using C-PLATFORM. Call set_checkpoint with a safe global position when a player reaches a checkpoint Area2D; call respawn when entering a fall zone. This code does not connect Area2D automatically; select the area body_entered signal in editor and call these methods from its handler after checking the player group. Respawn is deferred because a physics callback may be active.

extends Node2D
@onready var player: CharacterBody2D = $Player
var checkpoint: Vector2
func _ready() -> void:
    checkpoint = player.global_position
func set_checkpoint(safe_position: Vector2) -> void:
    checkpoint = safe_position
func respawn() -> void:
    _apply_respawn.call_deferred()
func _apply_respawn() -> void:
    player.global_position = checkpoint
    player.velocity = Vector2.ZERO

Checks to run in the editor

• A fall returns to last safe point, not origin.
• Player has no leftover falling velocity on return.

Native Godot 4.7.2.stable.official.ed1daf0bf headless compile and representative node-tree/runtime tests passed; see native-qa-results.json. Visual UI, audible output, exports and website submission still need separate checks.

Submit Relay Runner — evidence task

1. 1. Package the project, controls, route diagram and test logs.
2. 2. Verify all required features after restoring the ZIP.

Deliverable. Relay Runner source artifact, route diagram, test log and motion explanation.

Acceptance checks

• VGC-L075-T1. Fresh launch through completion and restart works.
• VGC-L075-T2. Falling after checkpoint returns safely with zeroed velocity.

Understanding question. Which two variables should respawn restore for immediate physical safety?

Include a downloadable project ZIP with project.godot, .tscn, .gd and original asset files when code changes. A private, teacher-accessible download link to that ZIP is equivalent. Screenshots or a playthrough do not replace editable source.

If this is still shaky. Use the three-jump route and one checkpoint as the minimum game. Remove optional hazards until required tests pass. Start with the first assigned task and re-run its acceptance test before adding the remaining feature.

Optional extra. Create a second optional route using the same movement code. Document one changed parameter, your prediction, and the observed effect; optional, not required for completion.

• Your first 2D game

  Free public tutorial; no account; external asset download is optional, not used by this course.

  · Opening this link does not submit the lesson.