Line

Royal

jig

Riddles with Answers

http://en.wikipedia.org/wiki/Riddle

Site
http://www.riddles.com/

Just
http://www.justriddlesandmore.com/

Brain
https://riddlesbrainteasers.com/

Good
http://goodriddlesnow.com/

Buzzle
http://www.buzzle.com/articles/riddles/

Directory
http://www.dmoz.org/Games/Puzzles/Brain_Teasers/Riddles/

Tube
https://www.youtube.com/results?search_query=Riddle+questions

Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=Riddle

2

34

1+4=5
1+4+2+5=12
1+4+2+5+3+6=21
1+4+2+5+3+6+5+8=34

Square