When you think about it, Bungie has been making games for a very long time, since 1991, in fact, a lot of games made, a lot of games to go back to play. Since the release of halo 4, I went back and have started replaying the Bungie-made halo series, starting with CE and going through to reach. Through these play-throughs, I noticed the amount of fun I had finding new glitches and new ways to accomplish mission objectives. I remember in particular, skipping the notoriously difficult sniper alley in halo 2's outskirts mission, finding a way to skip it all together, making my legendary play-through much easier. I had heard of people doing it before me but i had never found a way to do it myself. I think there is still much to be found in these games, especially out of map glitches. after this, i downloaded and played the aleph-one open source versions of the first three marathon games, of which I managed to finish the first two (stuck on the zero oxygen level of infinity). Unfortunately, I haven't been able to get any of Bungie's earlier games such as PID and Myth to work on my computer, but i believe that if more gaming community time was spent on older titles, a lot more things may have been discovered.