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In page SameGame:

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  1. In the "continuous" variant, whenever a vertical set of blocks has been cleared and the remaining blocks have shifted to one side, a new, randomly selected column of blocks will pop up on the other side, thereby allowing a game to be played for an extended amount of time.[citation needed]
  2. In the "shift" variant, when a set of blocks has been cleared, all remaining blocks to the top and left will shift down and to the right.[citation needed]
  3. The "megashift" variant is a combination of the rules of the "continuous" and "shift" variations.[citation needed]