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"Darkness Takes Over" is SMG4's 13th blooper. In this video Mario is bored, so he buys a cannon, shoots himself out of it, and accidentally breaks the Sun. The world becomes shrouded in darkness, so Mario has to recover the Sun by going completing various puzzles.
When Mario buys a new cannon he accidentally takes out the sun and makes everything dark. It is up to him to fix the lack of light in the world.