Update of the Map Reveal Tool:

Original by shadoworld56 (https://mods.factorio.com/mod/MapRevealTool)
Improved by royvanempel (https://mods.factorio.com/mod/MapRevealToolFaster)

This version works with Factorio 2.0 (Space Age)

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Map Reveal Tool. Adds a shortcut selector tool to reveal (or hide) the selected section of the map.
Click the Map Reveal Tool and make a selection area to reveal a section of the map.
Hold Shift while making a selection to hide a section of the map.

Warning : This mod forces the game to generate any un-generated chunks selected and can drastically increase the size of your save.

Special thanks to Ore Eraser by CaptainWHot : https://mods.factorio.com/mod/OreEraser for reference on setting up the selection tool.

Feel free to modify or update this mod as desired.