Here are the facts I have racked up about Gringotts Gate:
go to
http://interactive.mugglenet.com/duelling/level3.php and click on the door, you will get 10 galleons
You will also need to get past the bridge, how to do so is by right click, view source, then the link is near the botton of the page, and the code will be there also, can't miss it.
Then go to Snape and type in "Magic Marmalade" that will bring you to secret 14. You get the quidditch game.
I still cannot find Greeny the Owl, any answers.... how to cheat on the dueling club is when you die, press refesh, it keeps your score that you died with and continues you.
"28 92 4 6 101" - As for that, it is propbaby a riddle of math we need to solve, like add subtract those numbers and that type of stuff.