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On either side of the "validate" button at the bottom are controls to rotate the puzzle to this end.

That's still not acceptable, now it's harder to read both.

Considering that (from their stats page), 15k people have answered 326k puzzles, I'm pretty sure it's "acceptable" to somebody.

Those buttons could do with a 'position: relative; z-index: 1' so they are still easy to click when the table is rotated and overlaps them.