Of all the ZX Spectrum titles to be released so far, Diamond Digger by Battle Bunny & davepierce07 has to be one of my favourites. Following in a similar theme to Dig Dug, with ground based digging and falling rocks. The aim of this game is to collect the 50 cyan diamonds and the 5 keys on each of the 20 levels. Although it would've been nice to have some music while playing, the graphics for a homebrew are pretty decent with easy to master controls. Also make sure to collect the items scattered throughout the area and the avoidance of enemies!