Micro Cosmos
The 17 first levels were published on Visual Sokoban in 1999.
During the year 2000, some web sites accepted to publish the 20
first levels. Finally, I stopped at 40 levels. This set contains 5 levels
"3boxes", 26 levels "4boxes", 6 levels "5boxes" and 3 levels "6boxes". (Aymeric du Peloux)