What is the code for the last level for gravity grid

There are no codes for the 30 levels. But users can write new levels, which can be accessed by loading their codes, which must be on a single line.
An examples (select level loader, paste in):

code:0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,7,7,0,0,0,0,0,3,2,3,3,0,0,0,0,1,2,1,1,7,0,0,0,0;3