[The arrangement seems sound as is, but if he removes this cell and knocks it down to 20 givens, the difficulty would ramp up by quite a bit. But deleting it might make this clue over here overly ambiguous. Maybe it would be better to take away this cell over here instead...? 1, 3, 7, 8... No, that won't do either. 2, 4, 5, 7... 1 or 3 or 8, 1 or 6 or 9, 3 or 6 or 8 or 9... The top and bottom rows are no help, but the adjacent columns perhaps...]
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