CDO — 1.2

Solution

The tiles have different numbers of light/dark squares, suggesting they need to be ordered. The fact that the dark squares in the first six show the pattern you’d see on the faces of gaming dice indicates that it’s the dark squares. Arranging the tiles in a 3×3 square yields this:

XFIRSTMOX
TANNBAACD
NNDDOGGAU
ANDDOGGAL
IDPPENNFE
RMAAVUUHW
AMAAVUUHI
VGZZHFFIT
XLEURCAHX

The correctness of the arrangement is further confirmed by the matching letters along the adjacent edges.

The edge of the square, starting in the top-left and going clockwise, reads the clue phrase FIRST MODULE WITH A CRUEL VARIANT, the solution to which is

PIANO KEYS