### Fillomino (Checkered) by Robert Vollmert

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or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between a composite mode for line/edge drawing, a number entry mode, and shading for this variation.)

Theme: Hidden

Author/Opus: This is the 3rd puzzle from guest contributor Robert Vollmert. This variation was first introduced by Nikolai Beluhov.

Rules: Standard Fillomino rules. Also, it must be possible to shade some polyominoes black so that no bordering polyominoes are the same color (in other words, the grid must allow a two-color shading). Also, see this example:

Answer String: For each cell in the marked rows/columns, enter the area of the polyomino it belongs to. Enter just the last digit for any two-digit number. Start with the 5th row, followed by a comma, followed by the 7th row.

Time Standards (highlight to view): Grandmaster = 10:15, Master = 17:00, Expert = 34:00

Solution: PDF

Note: Follow this link for other classic Fillomino and this link for more variations on Fillomino puzzles. If you are new to this puzzle type, here are our easiest Fillomino puzzles to get started on.

• Carl W says:

59:54

Wow, what a puzzle that was. It took me quite to really get used to how to use the two-color constraint to make progress. And then I was totally impressed at the end. I could never have imagined a Fillomino puzzle where gjb ertvbaf bs fvmr guvegl-bar jrer guerngravat gb gbhpu rnpu bgure! So that was hugely impressive to watch happen. A fantastic construction.

• Murat Can Tonta says:

This puzzle is just brilliant. Persist to the end and be amazed 🙂

• Francis says:

Gotta love a puzzle with more than one big reveal. Superb.

• Neelix says:

This puzzle was a joy to solve and the finish was absolutely brilliant!

– Neelix

• Burak says:

Very nice puzzle! hilarious finish!

• Jack Bross says:

Truly amazing ending.

• skynet says:

Very difficult but a brilliant puzzle .

• hagriddler says:

Pushed that FAVE button ! 🙂

• JonaS2010 says:

Wow! I never really got into solving Fillominos, until i discovered those in this blog, but now i am absolutely in love with these puzzles! and this one was the best of them all. I have no idea whatsoever how one might construct such a beast. Incredible!!!

• Albert says:

Amazing and challenging puzzle. One of the funniest

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