Collect and remove one token

Collect and remove one token — guided practice

Use a distance rule and remove collected objects without counting them again.

Install the free Godot 4 editor suitable for your computer. Extract project.godot, main.tscn and main.gd into one new folder, keeping the names unchanged. In Godot Project Manager choose Import, select project.godot, then Import & Edit. Open main.tscn; use Run Project (F6 runs the current scene, while F5 runs the configured project). The game is a 640×480 top-down collection activity with no external assets. Arrow keys move; Space pauses; R restarts. Finish each changed case, then restore the supplied baseline before the next lesson.

1. 1. Read the condition

   Find player.distance_to(tokens[i]) < 22.0. Identify the player and token centers.

   You should see: A distance strictly below 22 pixels triggers collection.

   The visible square size and the collection distance are separate design choices.

2. 2. Collect one square

   Restart, approach one square and stop after it disappears.

   You should see: Score becomes 1/4 and three squares remain.

   Both score and remaining objects should reflect the same event.

3. 3. Test repeat prevention

   Move away and return to that empty position.

   You should see: The score stays 1 until another remaining square is collected.

   Removing the entry prevents repeatedly awarding the same token.

4. 4. Inspect removal order

   Read the loop from tokens.size()-1 down to 0. Explain why it walks backward when removing entries.

   You should see: An unvisited lower index does not shift when a higher entry is removed.

   Changing a list while walking forward can skip an entry after indices shift.