SoTC is epic the whole way through it..

Completing Sonic 1 the very first time (Which was also the very first time I had ever completed a game) was very epic to me, id seen my brother's future father beat it several times, and I could only just get up to Labyrinth Zone. But one day, I finally got there with about 4 continues and 16 livesand cam out mostly unscathed, losing only 4 lives..Starlight Zone was mostly a breeze, but I did lose three lives along the way..an then the EVIL Scrap Brain Zone, lost so many lives in there, came into Final Zone with two lives, and no continues, I was bloody exhilarated and nervous, and just beat him with the last life..

I was extremely excited and happy, as you might expect from one of that age..(I was 6 at the time)

As for other epic gaming moments, defeating many of the bosses in the Tomb Raider series, namely the Giant Alien Thing for level 15 of TR1 and the Spider Insta-Death Ray Dude of TR3, fighting Baphomet in Doom 2, fighting Indalecio Unlimted in SO2 and so many other occasions