For Heaven Dust 2 players, this puzzle solution guide will provide a few of the codes I wrote down during my play through, hope they can help you out.
Codes and Combinations in (mostly order) you encounter in the game
Office Area door – FLOWER FEATHER (top row / left, right)
FISHTAIL FLAME (bottom row / left, right)
First Pool Table – 8617
Second Fountain Gate – 326
Overlook Code – 2182
Wood Cabin wall box code – 0147
GraveYard Door – FISHTAIL FEATHER (top row / left, right)
FLAME FLOWER (bottom row / left, right)
Swimming Pool door – 1991
Second Pool table – 5186
There are some real obvious ones (such as Old House 2nd floor left side) that are not here, just the ones that require a round disc – or a little more not right in front of your eyes.