Diamond Mine 2 

Long Description:

In Diamond Mine II, the player takes the role of a young Gnome 
who has bravely entered the Troll Caverns in search of the many diamonds 
that are hidden there - a cunning Gnome should be able to grab all the 
diamonds right from under the Troll's noses.
The player has to collect all the diamonds scattered around each level to 
move onto the next level. However, the Troll Caverns are dangerous. The 
player will have to watch out for falling rocks which can be pushed left 
and right if there's a space, but will hurt him if the fall on him! An 
eye has to be kept open for Trolls, too. Trolls are usually easy to avoid 
- but if they catch the Gnome they will eat him! Fortunately, dropping 
rocks on them will crush them, but you have to be quick and careful.

Screenshots: