There was a forum post about this not too long ago. If I remember where, I will post it.
If your grid area is going to be that small, I would be lazy and just make invisible sprites, and when you click on it, have it spawn the block :). Invisible sprites still register collisions, like touches and clicks.
My math isn't great either, I'll see if I can find that post.
Awesome i hope you find that post,I would love to learn what im doing wrong.I also think you are right when it comes to using individual sprites,I started to do that at first and then got confused when it came to connecting them together around my player so i found a different route.
Im actually curious ArcadEd on how to make all of my single sprites snap to the grid and also have them follow/pinned to my players mask.
Thats where i got confused,and someone from the forums said to use a tiled backround but i shortly found out that there is not collision detection.
So i have been doing alot of this for nothing and its alittle depressing but hey thats Game Dev.I hope you find something tho because i came up short when seraching for Grid Based Topics