Collector interest
Tecmo puzzler from 1993, a prequel to Solomon's Key, published at the very end of the American NES's commercial life. This late timing gave it a very small print run, which makes it today one of the hardest NES puzzlers to find boxed and one of the best-valued end-of-catalogue targets. Its desirability rests on this very real end-of-generation scarcity, doubled with a stubborn reputation for demanding, refined game design.