some games i used to love on my zx spectrum 48k
(these images are better than what they were on the speccy)
rampage I used to love playing this with my brothers, what can possibley be more fun than smashing buildings, cars, helicopters and eating people.
gauntlet I used to love this, i can't remember if i could play this with my brothers or not. You could be a barbarian, an elf, a wizard or a woman- how original
IK+ i loved doing the splits and punching people in the crotch or being in the middle, jumping up and kicking both opponents in the face. This was a fantastic game to play against my brothers.
paperboy throwing papers whilst dodging everyday hazards- sounds boring, but it really wasn't.
ghostbusters An awesome game, as long as you don't cross the beams!!! If you did your guys would fall over and then get slimed by the ghost.
Goldenaxe Be a dwarf, barbarian or a woman and kill bad guys- great fun when playing with a friend. You could even ride weird creatures that kill bad guys by swinging their tail. I didn't own this but played it on my friend's C64 all the time.
North and South I used to play this against a friend all the time, i was always confederates. The campaign map was very much like the total war series, moving armies to control states. If you had 2 opposing armies in the same state a battle would ensue (in fact the more i think about it the greater the similarity to the total war series there is). You could also rob enemy trains and banks to fund the war effort.
I think this was my favourite game of all time as a kid.