mistrzyogurt:

I don't use ctrl+z/backspace to cancel last move. I just push mouse scroll and it work like a rubber

The problem is it won't always be as effective. two quick simple and common examples:

- After half solving a b/w puzzle, you accidentally filled the entire left side with black.
- After painting some sqare in green, as it should be, you later accidentally paint it with red and green isn't even one of your current two available colors.

in both cases cancel will do a quick job and middle button will be useless.

dcroebuck:

It appears from your descriptions that you do not bother to take the time to fill in the empty boxes. Is this the case, and if so, how do you remember where the empty boes are?

I will give a wide answer since this is a guide thread.

First i will point out the obvious - your puzzle is considered solved by the system whether you filled the empty boxes or not. Therefore, if you can solve the puzzle at the same speed without filling the empty boxes, that is the best way.

Now, let's consider multicolor puzzles:

- Unlike b/w puzzles, the blocks don't necessarily have empty boxes next to their edges.
- Moreover, the other colors are helping to find the borders and area of a certain block, effectively replacing the empty boxes's roll.
- Finally, ignoring the background color allow 2 colors use which is faster.

Going back to b/w puzzles, we look at the opposite claims:

- Blocks always have empty boxes next to their edges.
- empty boxes are needed for determining the borders and area of the black blocks, Furthermore, b/w puzzles are harder to guess and you should use evey trick you got.
- You always have room for the white color in your right button (as the mid can delete, you have all the abilities).

To answer your question: Naturally i find myself almost never filling empty boxes on multi-color puzzles, and almost always filling them on b/w puzzles, at least at the blocks edges on the easy ones and as much as i can on the hard ones.

A note to everyone else: I pretty much finished writing the stuff i had, i may add something every now and then but it mainly depends now on your additions/corrections/questions.