Batman (the isometric one) on the Spectrum.
Strangely enough it was the only game that worked on the 128k+ we got for Christmas, even the games that came with it didn't work.
A fun trip to Curry's followed a couple of days after!
I'll never forget Christmas the following year where as a naive child, I left a copy of Crash open on my desk with the review of Turtles open hoping that Santa would bring it me. Awwwwwwww!