Help with a floor building system!

Hey there. I want to make a floor building system but not triangle based or anything. I just need it to size in tiles when I drag my mouse. Similar to the system in retail tycoon 2. Could somebody give me a rough starting point to how I can tackle this? Thanks!
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You just need to snap the mouse drag start and end positions to the grid you want. The typical way to do this is.
gridPosition = math.round(someNonGridPosition / gridSize) * gridSize (for each axis that needs snapped)

I also have this which might help you get started faster: RegionSelect - Roblox

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