[This is a repost from our archives with new notes at the top (original post here): This second isodoku on the site altered the standard cube shape significantly by flattening out the whole center by looking like a 3 by 3 by 3 cube was removed. The new region shapes now hold some important constraints to make progress in the puzzle.]

PDF

or solve online (using our beta test of Penpa-Edit tools)

Theme: Missing my Rubik’s? This isodoku has 27 fewer “cubes” than Monday’s puzzle.

Rules: Standard Isodoku rules, using numbers 1-8.

Estimated Difficulty*: 2.5 stars

Time Standards (highlight to view): Grandmaster = 2:30, Master = 3:45, Expert = 7:30

Solution: PDF

Note: Follow this link for other Isodoku. If you are new to this puzzle type, here are our easiest Isodoku to get started on.