progression={
 ruleset:new(11,4,13,22,"ff"),
 -- level 1
 ruleset:new(5,1,9,0), -- by test: always winnable
 -- level 2
 ruleset:new(5,2,9,0), -- by test: always winnable
 -- level 3
 ruleset:new(7,2,9,8),  -- by test: always winnable
 -- level 4 (first challenging)
 ruleset:new(9,3,9,16, "l4"),
 -- level 5 
 ruleset:new(9,3,11,18, "l5"),
 -- fortune's foundation
 ruleset:new(11,4,13,22,"ff"),
 -- harder than fortune's foundation
 ruleset:new(11,5,10,25)
}