One of the more sought after pirate cartridges is
Super Mario Bros. 2, also known to gamers as
Super Mario Bros. 2j or SMB2j. This game
was never released outside of Japan. It's
essentially a level hack of the original Super
Mario Bros., including new and tougher levels, a
Luigi game option, and some new music during the
rescue of Princess.
What makes the SMB2j
pirate cartridge special is that SMB2j was
never officially released in cartridge format. It
was instead released on disk for use with the Disk
System. Leave it up to those pirate makers to figure
out a way to bring the joy of the Disk System
version to cartridges.

The hard-to-find Super Mario Bros. 2j.
There are many different SMB2j pirate
cartridges available. It's impossible to know
how many label and cartridge variations. Most just
have the regular game on it. Some are known to
have a level select option on the start screen, which
can help gamers get through what is a very tough
game.

An ad for Turbo Joystick Jr. and Joy Pair.
Expect to pay anywhere from $7 to $25 for
multi-carts. A SMB2j cartridge would probably go for closer
to $30 on eBay, possibly more, depending on what
extra features it has.