The Legend of Zelda (ゼルダの伝説) is an adventure game that needs no introduction to most NES players. But for those who do want an introduction, it is the first game in The Legend of Zelda series and appears to take place in the middle of one Link's neverending quest to defeat Ganon.
Even after collecting the Triforce, saving the princess, and collecting every kind of trinket and gizmo he can find, Link is still not satisfied. The best version of every object and status upgrade, including all the heart containers, every inventory item, the best sword, both bomb upgrades. and even the bait, all of that wasn't enough. Link wants to do all of that again, but with a harder quest. The 2nd Quest.
chatterbox decides to fulfill Link's request and does the 2nd quest while collecting every unique item available. If you want to know more about the run was done, including how every glitch was executed, you can read the author's notes.
The YouTube and downloadable encodes have author's commentary in the form of captions.
Watch this run being played back on a real console.