Basically, you want to know about the file format? Which language do you plan to use? DCME (and CLT) does have a walltile feature, that allows you to tile bases quickly. However, the feature is quite limited... Also, what would be nice is if the program handled itself the rotation of the tile graphics and such... I was looking forward to redo the whole walltile feature in DCME. There is also a feature to generate a walltile set, but again, it is very limited and only does a bunch of rotation and flips. If you can come up with algorythms that do all that nicely, would be great... I might be tempted to port them in DCME as well . DCME is in VB6 by the way.