Ok to beat mario 64 with only 16 stars you must start a new game, get 8 stars, beat the first Bowser, get the key he drops, open the key door to the basement, and get another 7 stars, (bringing you to 15 stars). Now when you get your 15th star there will be a yellow rabbit in the basement. Here you must perform a very difficult glitch to continue. You must get yourself and the rabbit through the door. When you catch him, don't grab the star he gave you just pick him up again and bring him to the door. Now what you must do is get as close to the door as you can with him and set him down as close to the right edge of the door as possible. This may take a very long time to accomplish (it sure did with me!) but what should happen is you all of the sudden shift inside the door. Yes, you will be INSIDE the door between the basement and the room that will lead out of the basement. Now when this happens don't move! Get into crawling position and face the rabbit, stand up and pick up the rabbit. If you miss you will walk out of the door and will have to start all over again! Anyways when you have the rabbit in your hands turn around and drop him on the other side of the door. I really suggest you watch this happen on YouTube before you attempt it because it will be eaiser to see how this works with your eyes. When you've done this, pick him up again and run over to the star door in the basement (the second boswer) and you must do this again. For some reason the second time is extremely easy, all you have to do is place him as close to the door as you can in any area and you'll just warp inside the door. Ok now run into the world that is inside that door and get another star (making 16 stars total). When you come out there will be a little hole thing in the ground which is bowser. After you beat him and get the key run up to the first floor again and put the key in the third door and enter the second floor. Now this glitch is even more difficult than the first (I think). You must do a long jump backwards up the stairs to the third star door. To accomplish this, stand with you back to the stairs run a little ways from the steps and press Z+A WHILE HOLDING THE CONTROL STICK THE OPPOSITE WAY YOU ARE JUMPING so you do a long jump backwards up the steps!! Make sure you never let go of the Z button. Now when this backwards long jump touches the ground, (remember you still should be holding the Z button) press A again while holding the control stick backwards to perform another backward long jump. Now on about the third time you do this Mario will start to look like he's doing very small long jumps up the stairs and making a weird noise, this means the glitch is starting, keep jamming the A button and Mario will suddenly fly up the stairs and smash right through the star door (well not actually, he more just goes through it backwards without opening it). Now again, I highly suggest you watch this on YouTube because it's very hard to do this without seeing it with your eyes first. Now that your through the door run up the the other star door and you will enter it. You will come to the "Never Ending Stairs" to make the stairs "Ending" do the stairs glitch that I described earlier. and you can then jump into the hole that leads to the final Bowser and beat him. With only 16 stars.