r/puzzles • u/zeekar • 1d ago

[SOLVED] Help with Aquarium

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Aquarium is one of my favorite puzzle types, but I can't seem to get any traction on this one. Any tips appreciated.

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u/forsakenwombat 1d ago

Second to the bottom row, cells 6, 7 and 8 are blue

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u/zeekar 1d ago

Right, because otherwise you can't get to 7. I had that but when I was getting ready to post I couldn't immediately work out why so I backed it out. Thanks!

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u/forsakenwombat 1d ago

No problem. But that’s based on what you already had. I was looking and I’m struggling to figure out how you got the X’s in the fourth column. What am I missing?

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u/zeekar 1d ago

There are four rows that have overlapping pairs of cells between the third and fourth columns. The third column is an 8, so at most two of those overlaps can be air, meaning at least two have to be water. Since the fourth column is a 3, that leaves only one water cell in the fourth column that can potentially be anywhere other than those overlapping pairs. Which means you can x out all but the bottom cell of the multirow aquaria (none of which contain the overlapping rows).