Released on December 27, 1991 in Japan for 7000 Yen.
Interestingly, Jirou-kun no Daibouken was first released in 1991 as a Game Boy game called "Lucky Monkey" in Japan. However, although the game is similar to the Super Famicom version (they do share the same theme), both games have notable differences - the levels as well as some of the enemies and bosses are slightly different, and the game doesn't require the player to collect keys, but to clear each level of its enemies instead. Finally, the way to pop the bubbles is different - the player has to press and hold up to burst a bubble, making the game slightly more difficult to play. The game also features letters to collect in order to access the bonus stages (the letters spell 'MONKEY' in the Japanese version and 'SPANKY' in the western port). Finally, Lucky Monkey doesn't seem to feature power hats nor sport balls, and bubbles split instead into black balls.
"Spanky's Quest [Model SNS-HJ-USA]