Hacks (in game type help or the symbol before the dash [ie: for scaffold type "scaffold"]):

cy - teleport on the y axis
cz - teleport on the z axis
cx - teleport on the x axis
scaffold - places blocks under you (creative only, skip to 3.0 for all gamemode scaffold)
stopscaffold - stops scaffold
kit - gives you full diamond armor & tools.
food - gives you 16 steak.
deez - nutz
gmc - switches gamemode to creative
gms - switched gamemode to survival
give (item) (amount) - gives you any item requested
portal - gives you supplies to make a nether portal