In this video game, the player takes control of Timmy, a guy who likes to collect coins and invests his time searching for hidden treasures. On his journey, he needs to avoid obstacles and enemies to reach the finale of each level and win. You can see how the video game looks in the following screenshots:

To play the video game, you will have to clone or download the project from https://github.com/angelotadres/RunAndJump in GitHub.

When you are ready, open the project in Unity. You will see the following folder structure in the Project browser:

To test the game, open the scene Title inside the Scenes folder and then press the Play button in the Unity toolbar:

To control Timmy, use the left and right arrows on your keyboard. Pressing the space bar makes him jump, and pressing it again while he is in the air makes him perform a double jump.

Currently, there are three levels implemented for this video game to test its functionality. In the next section, you will learn how to add more levels.

In this video game, each level is a Unity scene inside the folder Levels. When you start playing Run & Jump and then select a specific level, the video game call the LevelHandler scene and this starts the script LevelHandlerScene.cs.

This scene has all the GUI necessary for the level, and the script is responsible for the game's status detection (playing, paused, and so on), when the player wins or loses, and loading of the specific level scene using the method Application.LoadLevelAdditive.

Each level scene is composed of several prefabs. We will refer to these in the rest of the book as level pieces prefabs.

Navigate to Prefabs | LevelPieces to check the available level piece prefabs. The following table contains a description of each one:

Level Piece	Description
	Timmy (Player.prefab): You control this character in the game. Timmy's abilities are run, jump and double jump. There's nothing to envy about the Italian plumber.
	Angry Blob (EnemyAngryBlob.prefab): This character moves over platforms from one side to the other with an angry face. You don't like him and he doesn't like you so don't touch him or you will lose a life!
	Coins (InteractiveCoin.prefab): It is not a real platform video game without something to collect. Coins are one of the collectibles, and when you pick one, your score increases by 100 points.
	Treasure (InteractiveTreasure.prefab): Usually, this collectable is well hidden in order to motivate the player to explore the level. When you pick one, your score increases by 1,000 points.
	Sign (InteractiveSign.prefab): This will display a message on the screen when the player is around the sign board. The sign is used to give the player hints or miscellaneous information about the current level.
	Spikes (HazardSpike.prefab): These sharp spikes are placed in locations that make it harder to reach your objective. Don't touch them or you will lose a life!
	Dirt (SolidDirt.prefab): This is used as a building block for the level.
	Grass (SolidGrass.prefab): Like Dirt, this too is used as a building block for the level. The only difference is this it's green on the top.
	Goal flag (InteractiveGoalFlag.prefab): The main objective of the video game is to reach the Goal flag at the end of each level. A well-designed level will have a lot of hazards and enemies between you and the goal flag.

To get a better understating of what is involved in creating levels, let's create a new one. The goal is to copy the following level (or at least try to do so):

For this, you need to perform the following steps:

Run & Jump comes with a custom tool that allows you to set up the order and the name of the levels and also add these to the Scenes in Build list automatically. We must use this in order of make our level usable by the video game (one of the requirements is to include the suffix _level in the name of the scene).

In the Unity editor menu, navigate to Tools | Level Packager | Show Levels Package:

This will display the following in the Inspector window:

Currently, there are only three levels listed, so click on the + icon to create a new item in the list. Now, add the scene you created in right column and add the string My Level in the left column. This will add your level as the fourth one.

Save the changes by clicking on the Commit Levels button.

To check the scene you created, open the scene Title inside the Scenes folder, and then click on the Play button to run the video game:

Now you know the necessary amount of effort it takes to create a level for this game; so let's make this level creation process the first thing to improve.