lvl1
lvl2 begin
lvl2 complete
lvl3 begin
lvl3 complete
lvl4 begin
lvl4 complete
lvl5 begin
lvl5 complete
lvl6 begin
lvl6 complete but need time optimization
lvl7 begin
lvl7 solved. No time bonus
lvl8 complete
lvl9 start
lvl9 Complete
Work in progress