Grimrock

If you mean also able to move in any direction rather than the base 4 directions, then you're talking about a totally different game. The entire engine, and also all the combat and puzzles, is grid based, and would not work without this grid. You could consider a hex grid instead of a square grid, ...

Is there a mod that does this? By always on, I mean that the free look usually done by MB2 would control all turning and would have 360 degrees instead of just 180.