Boulder Dash II - Rockford's Riot
Platform: MSX
Region: Europe
Media: Disk
Controller: Keyboard, Joystick
Genre: Puzzle > Action 
Gametype: Undefined
Release Year: 1986
Developer: First Star Software
Publisher: Databyte
Players: 1 - 2
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In part two of the "Boulder Dash" series, game design hasn't changed compared to part one, so you still have to mine diamonds while avoiding falling rocks and cave monsters of all sorts. As in part one, later levels become more difficult because many puzzle elements are added.

http://www.mobygames.com/game/msx/boulder-dash-ii-rockfords-revenge