Sonic the Hedgehog #7

"Uncle Chuck's Treasure": Rotor accidentally sends Tails through the roof - literally! It is then that the Freedom fighters find an old treasure map belonging to Uncle Chuck. They believe the "treasure" may be an invention that will help them in finally defeating Robotnik! According to the map, the treasure was buried in the old Mobius National Park; unfortunately, the park had since been destroyed by being turned into a toxic waste dump! And when the Freedom Fighters find the spot, Robotnik attacks!