Well, this is Lord Diego's
6th Boulder Dash-game, called
Diego Dash VI.
Diego Dash VI begins with
3 very similar caves, not very
interesting. After completing cave 3, Diego Dash VI is
growing in difficulty. Unfortunately cave 8 is very very
easy. I prefer cave 13 where you can play "running man".
In mostly of Lord Diego's
caves you have to collect the
maximum of 99 diamonds to open the exit door. I don't
know why, but it's absolutely typical for Lord Diego's
caves. Also in Diego Dash VI are several caves where
you have to collect 99 diamonds.