If you try out the counstruct 2 tower defense demo you can see that when you place the turret in the editor and ingame they place in exact squares, like in minecraft or terraria. I really don't know what you have to do to make this. I'm trying to create a platform game and building my maps would be a lot easier with this. I thought that pixel rounding does this but it doesn't.
Thanks in advance
In the view banner at the top, there's an option for snap-to-grid and also grid size.
Thank you for such a fast reply
i made a tower defense a while ago called tiny defense.
Here is the small snipet to make it snap when holding.
<img src="http://i.imgur.com/H8uipQSl.jpg" border="0" />
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Thank you mrPeanut for your help too