Sure is. You use the up and down arrow keys (unless you are using a Mac) to change the level of a target hex and Ctrl-Up Arrow, Ctrl-down arrow to do the same for the firing hex. If you have a mac there is a key combo that works but I forget what you have to do). See Help - LOS Check for more info,@DougRim just a follow on question, is there any way to have the LOS tool account for the elevation in the source and target hex being different to the base level ? i.e. can you trace line of sight from LVL2 of a building to Level 1 of another building ?