nice, I`ve tried to make something like this, but failed.
As soon as you try to make something other than a plain field with this tool you will get hit by lightning everytime
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What went wrong with your map? From the pic it looks fine to me.
I have a problem with a 'death zone' at the last 3 units of each level. For level 1, this means Z = 63, 62, 61 (Z = 64 counts for level 2 already). It is nearly impossible to choose those fields as target for movement, or select a soldier placed on one of those fields (the "small_house" map is a good example, as the same happens at the fields next to the upper door there). Technically for level 1 this means, the highest field you can access is Z = 60. From there you have to jump right into level 2. I had to make those 'steps' between levels to solve this.
Did you have a similar problem ?