Multiplying a cube to a plane

Okay, So, This guy helped me once a while ago where he took a face of a box, And subdivided it a bunch to have the effect of multiple blocks. (minecraft sutff) Now, I’m wondering, Could I take cubes, And connect them together? So they are full cubes, But they are connected like in minecraft?

I already have a cube prepared, I just need to know how to make this change.

If the cubes are part of the same object, select all, and remove doubles from the tool shelf in the 3D windoe in edit mode. If this doesn’t work, select each pair of vertices you want joined, and merge them together, using the “merge command” (Alt-Mkey),