T-Mek (I think it was called) and Metal Slug
I spent so many quarters in Metal slug.
However there's PLENTY i loved playing besides it..
Going through wikipedia's collection of arcade games i see;
Numbered ones
The flight games 1942 and 1943
The A's didn't really have many i loved, but it had a few i liked such as asteroids and aliens vs predator
The B's had quite a few, including the always classic Battlezone, beach head, and one i always laughed at, Burger time (though it was called Hamburger time in the UK).
For the C's we had the Capcom vs SNK 2, Commando, Contra.
In the D's i loved Dig dug, Double dragon, and who hasn't loved playing Donkey kong!!!
For the E's there was only one.. Empire strikes back released in 85.
Under the F's there was only one, Fatal fury.
Under G's there was a few. Galaxian, Gauntlet (in all incarnations), Golden Axe1 and 2, Ghosts n goblins and The goonies,.
For the H's all i readlly enjoyed were the gun holding "house of the dead" series..
Under the I;s all i loved playing was the Indy and the temple of doom game..
K's had the King of monsters, the King of fighters duo which kept me plenty occupied..
I don't remember any under the L's..
The M's had a #, including Missile command, Marble madness, Marvel vs capcom, marvel vs streetfighter, I even spent a lot of time on Michael Jackson's moonwalker game!!
For the N's Ninja Gaiden occupied my time a lot, but that was it.
Under the O's all the 'shooting gallery ones "Operation wolf/tiger/thunderbolt",
For the P's, who DIDN'T play Paperboy,
Under the Q's i loved both Quartet 1 and 2,
For R' i lovd most ANY of the Raiden series, Rampage (all versions), Robocop and Rolling thunder.
Then for the S's we had the Two Seawolf ones (iirc the first that used the overhead pull down thinggy), along with Silent scope, Both Soulcalibers, Starwars (1983), Starwars 1993, The streetfighter series (though not all)
Under the T's, i liked both Terminator 2, the TMNT ones, Tron, That's about it.
Neither U to W had any.
X had most of the Xmen ones, but that was it. And neither Y or Z had any..