For the cells you have to find, the goal is that they have unique solutions. The other cells do not need a uniqueness condition for the values in the cell. Uniqueness in columns / rows / boxes again doesn't apply. It does where applicable for the cells that you are trying to find.
For Fog of War its to find a visible cell that has a unique value. You then place the digit, reveal the extra conditions that are added to the puzzle. Then you itereate.
I think is is similar to the puzzle solve.
For Puzzle Solves
For the cells you have to find, the goal is that they have unique solutions. The other cells do not need a uniqueness condition for the values in the cell. Uniqueness in columns / rows / boxes again doesn't apply. It does where applicable for the cells that you are trying to find.
For Fog of War its to find a visible cell that has a unique value. You then place the digit, reveal the extra conditions that are added to the puzzle. Then you itereate.