The ZX Spectrum original of Ant Attack was so good that it spawned a decent 1984 Commodore 64 version, by Paul Fik and Bitterne Software.

C64 Ant Attack is pretty much identical to the original, but with a few extra colours and slightly different system fonts. Possibly even runs slightly faster than the Spectrum original, although that could have been the time distortions caused by the magic mushrooms… I’m not sure.

More: Ant Attack on Wikipedia