Let's use an interval event to make the litter appear at random locations on the stage.

• Use an Interval Event to start polluting the stage. Change the interval to 1.
• Add Global Variable inside the event the event and change the variable to timer.
• Use two Random Integer commands to create two random values named x and y inside the event.
• Set the parameters of x to -225, 225 and of y to -225, 0 so that the litter only appears on the ground.

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