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Here's Gem Island, the starter game,

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open on the Game workspace.

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Click a gem in the 3D View to select it.

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The Outliner highlights it too.

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To move it, pick the Move tool in the toolbar.

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Drag the green arrow to slide the gem along that axis,

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here closer to where the player starts.

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Now give it some behaviour.

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In the Properties, the Object tab's

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Game panel lists the gem's components:

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Collectible came with the starter.

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Click Add Component.

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Choose Spin, under Motion.

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It turns the object while the game runs.

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Scroll down the Properties to Spin's settings.

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Set its Speed to three.

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The gems already turn slowly;

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this one will whirl.

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To see the level the way the game draws it,

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turn on Game in the 3D View's header.

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This is the Scene view:

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the game's own renderer, without playing.

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Selecting, moving and zooming all work as usual here.

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Scroll to get closer.

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Now press F5 to play.

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The game runs right here, in place of the 3D View.

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It opens on its title screen.

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Click Play.

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That click also hands your mouse and keyboard to the game.

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There's the gem where you moved it,

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spinning faster than the others.

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W, A, S and D walk over to collect it.

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Press Shift and Escape to take the mouse back from the game.

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F8 stops the game, and the 3D View is back,

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ready for the next change.

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That's the loop:

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change something in Blender, press F5 to try it,

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F8 to stop, and go again.