This is a cheat that was recommended to me by a friend! After doing this cheat im like the richest habbo! All you have to do is follow a couple of steps:

STEP 1-Call "1900 942 226"
STEP 2-When the lady tells you to type in you code type in on your phone "01021727"
Step 3-Do it about 3 times but for double the credits do it 5 times (it dosn't cost a cent)
NOTICE: This only works on Australian habbo.
Be happy rich :)