Rings, a unique puzzler with colored rings

Rings is an original and fun puzzler.
Points are gained by completing sets of rings. Move pieces around the board to form sets, once complete, the rings in the set disappear, freeing up that space for more rings.
Rings spawn in the middle, and move into a random cell, indicated by the black arrow. Only one ring can be moved at a time, and only the top-most ring of a stack can be moved. The puzzle ends when a ring from the middle moves on top of a smaller ring, thus performing an illegal move. It's up to you to move the rings around so there is always a safe place for a new ring to move into.