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Tried solving top down without marking. Can confirm, clearing out 2/3 of a puzzle full of blank lines was not fun. As Druid said, flagging rows as 0 is a fast solution, and removing the unnecessary layers is a better solution.

Not great. Too many of the puzzles are 15 x 15, and only comprise of a height of just 3 high, forcing you to delete virtually a majority of unused tiles. This could have been made considerably more pleasant by setting rows/columns as zero so they could be automatically cleared rather than forcing the user to manually clear. Or simply by reducing the height of the puzzles, because ultimately there's nothing to be gained by deleting the top two-thirds of the puzzle, it's just tedious game-play.

Try to solve by working down form the top, like real archaeology, without marking if you can :)