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