I recognize the wait blocks where it tells you to wait for a certain amount of time and the one that says "when green arrow clicked." I didn't recognize the forever, switch background, and next costume blocks because I didn't get to those labs.
The scratch screen is 480 x 360 pixels large.
The center of the scratch screen is at the coordinate (0,0)
The units of measurements are pixels.
You can have as many sprites as you want on the screen but you only ever have one stage. This makes sense because there is only one place that your sprites can be visible from.
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