"A fantasy d20-themed dungeon crawler", to quote DarkGod's comment. Inspired by Incursion by Julian Mensch. Made available under Open Game License. This is a non-profit fan project. No money is made. There are currently only two people working on the mod. However, we have released several beta versions so far.
The worldmap is supposed to be underground and bright white tiles are not necessarily conducive to suspension of disbelief in this case... Worry not, they weren't deleted and will certainly make a more appropriate appearance.