Second quest:  Normally, you would have to successfully complete the game in order to unlock the second set of dungeon maps. Instead, enter ZELDA as your name. You will see a white sword in Link's hand to confirm that you are now on the second quest. For the most part, all the levels are in different locations, and the maps have changed.

Save any time:  Pause game play, then press Up + Y + A on controller two. Select the "Save" option that appears with controller one. Note: Selecting the "Continue" option will bring you to the start of the world map if you are currently outside or to the beginning of the dungeon when inside with three hearts of health.

Quick save:  Press Start to pause game play, then press X. The end game options will appear.

Expert mode:  Enter ZELDA as a name to start on the second quest. Note: This is just like the first quest, only slightly more difficult with some items in different places, and slightly higher prices in some stores.

Save Anytime on Majora's Mask  -  On Majora's Mask you can make a save anytime! You need both files open for this or it won't work. Simply save the game at an owl statue like normal, then when the game exits, go to the file select and copy the file you just saved to Save 2, then you can continue the game without having to worry about the game freezing (making you lose all your progress) and you can get a good save at any time.

More Bottles in Ocarina of Time  -  In The Legend of Zelda: Ocarina of Time, to get more bottles first equip a bottle, in one of the slots. Then go and find something to put in a bottle (i.e.: Fairie, Bug, Fish, or anything else you can think of!). Now, hit the Button the bottle is in to catch the thing and hit start directly after hitting the button. Now select an item you do not want (Claim Check is good to use after you get the Biggoron's Sword) and equip it where the bottle you were catching something with was. Press start again and you will see Link still catching the item. Now you have an extra bottle. You can have 24 bottles, but then you would not have any sub items!