Last year, I tried out Cookie on a ZX Spectrum emulator (for Mac OS 8.6).|
Not only was it as enjoyable as I recall it being in my infancy, but I got considerably further this time as well. Those sorts of 'arcade' games had tremendous replay value: you could play them again and again and again..
Nemesis (Gradius) on the MSX has also stood the test of time.
#9452778, By Games that have aged well/badly