Boulder Dash EX (J)(Polla) is a Japanese release of the enhanced Boulder Dash game on GBA. It shares the same core gameplay as other Boulder Dash titles—navigating mazes, using boulders to crush enemies and clear paths.  The 'J' indicates this is a Japanese version, which may have some unique features or content compared to other regional releases.  The specific developer behind this release would require additional research.

Boulder Dash EX (J)(Polla)

Bouken-Ou Beet - Busters Road (J)(Caravan)