The Dimension Blender is a device created by Doctor Robotnik and Grimer on Shanazar. Combined with a transportation belt, the machine was designed to grow the microscopic planet to the same size and space as Mobius, effectively combining the two worlds. In the confusion, Robotnik would emerge as world ruler of both planets.
The machine worked perfectly, combining both worlds. However, there was no chaos and destruction as expected. Instead, the areas of Shanazar merely appeared on Mobius to create New Zones. The Dimension Blender either still exists in one of these Zones or was destroyed during its execution.