A Adding Big Numbers C Catching Car Mileage Numbers Codewars style ranking system Connect Four D Decode the Morse code, advanced E Escaping The Matrix F Find the unknown digit H Human readable duration format L Last digits of N^2 == N M Matrix Determinant Most frequently used words in a text N Next bigger number with the same digits P ParseInt() reloaded Pyramid Slide Down R Range Extraction Recover a secret string from random triplets Roman Numerals Helper S Snail So Many Permutations! Strings Mix Strip Comments Sum by Factors Sum of Intervals Sum Strings as Numbers T The observed PIN Twice linear