This document lists any errors and/or corrections to the printed material of the book. This does not indicate errors with the code in this repository, which is tested and updated separately.
NOTE: Page numbers are for the print version. Ebook page numbers may be slightly different.
p. 42 - [TYPO] In the Tween code snippet, the node name should be CollisionShape2D, not CollisionShape2d
p. 43 - [MISSING IMAGE] The image of the "Detach Script" button is missing at the end of this sentence:
Change the name of the root node to Powerup and remove the script by clicking the Detach script button
p. 44 - [MISSING TEXT] After this paragraph:
The powerups should appear unpredictably, so the wait time of PowerupTimer needs to be set whenever you begin a new level. Add this to the _process() function after the new coins are spawned with spawn_coins():
Should be the following code snippet:
$PowerupTimer.wait_time = randf_range(5, 10)
$PowerupTimer.start()
p. 46 - [MISSING TEXT] When adding the Cactus to the game, before the line
Play the game and see what happens when you run into the cactus.
Should be the following instruction:
In the Main scene, add an instance of the Cactus object by pressing the "Instantiate Child Scene" button and then position it somewhere in the play area.
p. 58 - [CLARIFICATION] "see the Appendix for an overview of transforms" should instead refer to Chapter 5, where transforms are discussed in more detail
p. 66 - [CLARIFICATION] The following sentence:
Don’t forget to drag rock.tscn onto the Rock property.
Should be moved to after the second code snippet (defining spawn_rocks()).
p. 69 - [TYPO] In the last code snippet, the node name should be Sprite2D not Sprite2d
p. 73 - [TYPO] On step 7, when adding the VBoxContainer, the layout option in the dropdown is called "HCenter Wide", not "Center Wide".
p. 75 - [MISSING] After defining the new_game() function should be the following:
To update the player's score when they destroy a rock, add the following code to the
_on_rock_exploded()function:
score += 10 * size
p. 77 - [CLARIFICATION] Although TextureProgressBar is mentioned here, it is not used in the game's UI until the later section regarding the player's shield functionality.
p. 84 - [CLARIFICATION] After adding the line
@export var enemy_scene : PackedScene
Should be a reminder to assign the enemy scene to the property in the Inspector.
p. 99 - [TYPO] In the table of input actions, 'S' is listed for "up" and W for "down". This should be reversed.
p. 110 - [TYPO] In the "Scene Setup" section, the object's Collision/Layer should be set to "items", not "collectibles".
p. 149 - [CLARIFICATION] "See the appendix" should instead refer to Chapter 7.