Ok, I’ve taken a closer look. Seems there is a good reason why I was confused as to where in the Grid Manager there are references to ATBTT_GameMode. I have already removed all such references in the update I am working on, so this should no longer be a problem come next update. In the version currently on the marketplace ATBTT_GameMode is only referenced twice in BP_GridManager. The first is in the Reachable Index Closest to Target function and the other is in the beginning of the construction script to simply set up a reference to the game mode.