How to make a blocky grid showing

So im try to make a game that can building just for have fun, but i dont know how to make so that like grid bordering the build block like in minecraft, example:
people turn on the build mode, then a blocky gui in a block like minecraft showing
like that, sorry for messy engglish

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U will prob need to make a dedicated gui for the grid but if you are asking how to make roblox studio show grids enable thoes :
image

i want to make a grid inside the game

Hmm… I would think you need some SelectionBoxes class