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Interactive solving website

For help/rules on solving, please look at the website's "help" section, which lists fillomino rules. Please use the website to solve the puzzle unless you are unable to. Post a screenshot of the finished puzzle in your answer.10x10 Fillomino

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5
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Deductions of the form "this region must take this square or it would be cut off" get this far:

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Next, make sure not to create regions that are too big:

The 6 region can't connect to the clue in R5C4, and that leads to another chain of deductions. enter image description here

Continue extending...

with the 7 and 8 in the lower left, and make sure not to cut off the 8 in the top right with the 4.
enter image description here

And finally...

We have 28 cells left over. 6+7+12 = 25, so there's no room for another big region -- the 12s must connect. And sure enough, there is only one way to do that, giving the solution:
enter image description here

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