Ridler or Riddler: How To spell?
The word Ridler is misspelled against Riddler, a noun meaning "One who riddles (grain, sand, etc.)."
Riddler has double "dd" is mispronounced as "d"Remember double 'DD' in between the strings Ri & ler which should not be misspelled with single 'D'
Wrong Spelling:  Ri-d-ler  Correct Spelling:  Ri-dd-ler 
Find more wrongly spelled words of Riddler to spell it well.