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Yes, that sounds Ok to me(sorry, I'm no expert), but you can also use Mapzoid and afterwards TileZed to add/remove a little bit of terrain. 33x33 cell's is huge, CzarUltra. Why not start with something smaller first?

Hello CzarUltra, the area of the city itself will rougly be around 10km2 = 33x33 cell's.

Yes, good idea Suomiboi. So, here is the answer I was looking for: And some 'other' answers, if you like a more "free" Last Stand mode:

EDIT: found the answer to my own question. People with the same problem can pm me, don't wan't to spoil things. Sorry for taking up topic-space .

Hello, Currently, I'm making a "Last Stand" map, with those wonderful map-tools. When 'Wave 17' starts (after +/- 2 hours of gameplay) I get the message 'stack trace'. What does it mean?