Updating Checkbox - Run-time Error 91 - Object variable or With block variable not set

You would create three option buttons for each row. If you use Forms controls you have to put each group of three into a Group Box. If you use ActiveX then you would set the Group property to be the same for all three.

Frankly I think using this many controls is a error-prone to create and maintain, even though it's kind of cool for the user.

Here is an example where you just click directly on the cell itself. I did it down to row 39. The corresponding code is in the sheet module.