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Spot the Difference In this chapter, you will make a basic Spot the Difference game. The coding is quite simple, and it’s a great way to start exploring the IDE. All of the images used in the game are available in the Resources folder that you downloaded. This project uses a background image and instances of an object to mark where the differences are, plus a control object for keeping track of the player’s progress. The aim of this game is for the player to find all of the differences between two images before time runs out. When you start GMS2, you will be presented with the start screen shown in Figure 1-1.

© Ben Tyers 2018 B. Tyers, Practical GameMaker Projects, https://doi.org/10.1007/978-1-4842-3745-8_1

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Figure 1-1.  The Start screen

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Click New, as shown in Figure 1-1, and then select GameMaker Language, as shown in Figure 1-2.

Figure 1-2.  Starting a GameMaker Language project

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Next, give the project a name, for example spot, as shown in Figure 1-3.

Figure 1-3.  Setting a name for a project

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You will be presented with a screen like the one shown in Figure 1-4.

Figure 1-4.  The initial start screen This may look a little daunting at first, but don’t worry; after you have completed the first five chapters of this book, you will be comfortable enough to find your way around this screen. If the Resources tab is not shown on the right of the window, you can click Windows in the top menu and then Resources.

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This game of Spot the Difference uses four images, so load them now. In the Resources tab, right-click Sprites and then Create Sprite, as shown in Figure 1-5.

Figure 1-5.  Creating a new sprite

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Next, name the sprite bg_1 and click Import, as shown in Figure 1-6.

Figure 1-6.  Naming the sprite and importing it Navigate to the Resources folder and load in Spot_Level_1, as shown in Figure 1-7.

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Figure 1-7.  Loading in a sprite When the dialog pops up, click Yes, as shown in Figure 1-8. You can also check the “Don’t show the message again” box, also shown in Figure 1-8.

Figure 1-8.  Dialog pop-up 8

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Your screen will look something like Figure 1-9.

Figure 1-9.  A sprite loaded in Now, save and close this window. There are a few ways to do this. The first is to drag the window title with the left mouse button held down and then click the X. The second is to hold down the middle mouse button in an empty area and drag the workspace contents so you can see the close X box, as shown in Figure 1-10, and click it.

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Figure 1-10.  One method of closing a window You can also right-click the window bar and select Close, as shown in Figure 1-11.

Figure 1-11.  The other method of closing a window

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Now, create a new sprite named bg_2 and load in another resource so it