Destroy the rolling balls before they fall off the platform.
Not an easy game whereby you have to be very handy. You have to drop a mine and let detonate them when a ball rolls over that mine.
Different balls react differently to being mined. Blue balls disappear. Green balls take all surrounding balls with them (except black). Red balls disappear, but take the last row of blocks with them. When red balls fall, they also cause the last row of blocks to fall. Finally, black balls are indestructible.
Note that each level after 1 has a password in the lower left corner. Use this with the "Jump to Level"
button if you want to skip early levels. Your ending score, of course, will be lower this way.
Arrow keys or numpad 2,4,6,8 = move
Ctrl or numpad + = set mine
Shift or Enter = detonate mine
P = pause
F4 = screen size
F5 = save game
F6 = load game