Populate a list in non repeating numbers in an array using random.
After that, go to each element in the array in order.
While array.width<your level
-set variable to random
-array contains variable- do nothing
-else- push variable to top
array.width> level
-every 0.2 seconds
--go to element.arrayAt(someothervariable)
-- add 1 to someothervariable