Hah, shooters!
Okay, so based off the responses so far such a "marathon" would look like this:
Contra III: The Alien Wars
Donkey Kong Country
Mega Man X
Donkey Kong Country 2: Diddy Kong's Quest
Kirby Super Star (via DS version)
Donkey Kong Country 3: Dixie Kong's Double Trouble
But feel free to keep the responses coming! I just felt like posting my reaction here.
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Currently Playing - Resident Evil 4