Magic Meanies is a ZX Spectrum video game developed and released by CDS Micro Systems in 1983.
The player, Meltec the Wizard, digs tunnels to collect lumps of lead.
To progress to the next screen, Meltec must also collect a wandering cherry and avoid roaming enemies.
Undermining these and allowing them to fall onto an enemy can kill it, or at least block a path.
[1] Crash magazine awarded Magic Meanies 58% in issue 2, criticizing the small, jerky graphics but highlighting the skill and quick thinking required.