add more levels

README.md

@@ -52,22 +52,23 @@ logic mostly like https://git.crispypin.cc/CrispyPin/marble
 
 ## levels
 ### intro, basic mechanics
-- output a zero (marble, io)
+- output a zero (marble, output)
 - output multiple numbers in sequence (digits)
-- output zeroes forever (looping, button, silo output)
+- output zeroes forever (looping/arrows, button, silo output)
 - copy the input (input)
-- copy only odd input numbers (comparator, math,   flipper)
+- increment every number (math tiles)
+- copy only odd input numbers (comparator, flipper)
 ### 0-terminated list processing
 - copy the second list
 - calculate list length (math, silo input)
 - count instances of 5 in a list
 - reverse a list (bouncing)
-### user-friendly numbers
+### text
+- convert text to lowercase
 - convert a number to decimal ascii
 - parse an ascii number
-- convert text to lowercase
 ### advanced list processing
 - index a list
-- search a list
+- reverse and return the first n elements of a list, with n given first
 - add two lists element-wise
-- sort list
+- sort a list