LoZ: Ocarina of Time: beat it in 7 hours collecting 100% of EVERYTHING! (heart piece,gold skulls,gold scale,quiver/slingshot upgrades,no hit on Ganondorf/Ganon,ect ect.)
but this was AGES ago,when the N64 was about half way threw its life-cycle (give or take).
i cant even remember my age at the time...all that i remember is the ENTIRE run (i could detail it 100% threw,but it would take hours of typing...not to mention such a waste of brain space,huh?). yes...i played the game THAT much,i still know the game like the back of my hand...but sadly,i gave my N64 away...WORST DECISION I EVER MADE REGARDING GAMING! Dx i still regret it to this day...even with all our emulators now (its just not the same,dammit!),its at least its a nice nostalgic feeling when you play again...
though regarding other game,i have beaten many other games in one sitting...but seriously nothing i do will ever top this,lol! oh,and before you go "your lying,thats impossible" do you REALLY want me to type out EVER SINGLE LITTLE DETAIL to you? cause i can,though i doubt you REALLY want to read hours of text (yes i will explain it in that much depth and detail!).
i say this cause i know people...