In 1993, a special competition was held where uniquely crafted cartridges of Star Fox were produced for said competition. They became known in time as Star Fox Super Weekend Competition.
This version of Star Fox has modifications such as additional rings and an overall more challenging experience than the original. It only features the first two levels, but includes a never before seen bonus stage.
Because these were limited competition cartridges, Star Fox Super Weekend Competition can sell for over $1,200.