The Hard Knockin' Rockin' Wrestling Ring sold for about $9.00 new. This is what the kids on the block held their wrestling matches with. The first wrestler with 2 out of 3 falls was the loser. This was (and still is) a great way to hold step ladder tournaments. It was a pretty great toy, with its only drawback being that the clips couldn't accommodate many of the large and smaller figures.
The ring came with two figures not featured on the official mail away poster, however they weren't specified anywhere as being exclusive to ring. It originally was believed by many, that the figures were specifically sculpted to better fit into the clips of the wrestling ring. What's curious however, is that each of these figures have a twin.
The M.U.S.C.L.E. on the left is the figure included with the ring. The slightly larger sculpt on the right shows up on the poster as M.U.S.C.L.E. #141. Being so close in size makes it harder for newer collectors to distinguish the two apart, especially if you don't own both figures. Therefore, another sure fire way to identify them is by looking at their belt buckles. The ring figure has a belt that is rectangular in shape, while #141 has a round buckle.
Another picture for size variation reference..
While M.U.S.C.L.E. Man's twin was nearly identical, Terri-Bull had his own Green Doppleganger. You could only obtain the green figure by purchasing the M.U.S.C.L.E. Mega-Match game.