Puzzle #507 - Hindsight is 2020 (Product Cave)

Also in the "Hindsight" round I made a Product Cave using only the number 20, to hit both themes. I... don't really remember why I did this. The puzzle ended up being worth 30 points, which sounds about right to me. As a reminder, the rules are the same as standard Cave, except the number gives the product of the horizontally and vertically visible cells.

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