This is awesome , thnx man , very cool contribution : )

Outstanding work... I like it very much
Serlink

But it's sometimes a little bit buggy.
Some blocks changing their psoition, but you can walk on the old place.
Some times there is a crash if you set a block...

But anyway a good contribution

i got always crashes,but i also love that contribution...as they said..own blockes
I guess u calculate x/0...

1 things: if i set one times the player start block i can't set it somewhere else:crash

edit: i i found out it right u use for 1/2 and 4 diffrent bmps, but also by the pipesso if i have 2 pipes netxt to each other they won't be visible anymore

Thanks to everyone, I'm glad you like it.
Yes it is really buggy and Scorpion, you are right. The code always tries to replace for example 4 tiles of the same type by one bigger tile and that's why some panels become invisible if they are not meant to be placed next to each other (pipes).
For own tiles just replace the tile1.tga (64x64), tile1b.tga (128x64), tile1c.tga (256x64), tile2.tga ... and so one with your tiles and/or modify the code to your wishes. Open the script file for more information.
If I have enough time I will continue to work on this project.

Felix