The document contains a list of various websites and resources related to game design and fun theories. It includes multiple references to Nicole Lazzaro's Four Keys to Fun and other influential figures and theories in the field. The links provided point to blogs, articles, and websites that explore concepts of fun in gaming.

2. http://blog-efl.blogspot.com

3. http://www.theoryoffun.com

4. http://www.nicolelazzaro.com/the4-keys-to-fun/

5. http://mud.co.uk/richard/hcds.htm

6. http://www.jesseschell.com/

8. http://www.theoryoffun.com

9. http://www.theoryoffun.com

10. http://www.theoryoffun.com

11. http://www.theoryoffun.com

12. http://www.theoryoffun.com

13. http://www.nicolelazzaro.com/the4-keys-to-fun/

14. http://www.nicolelazzaro.com/the4-keys-to-fun/

15. http://www.nicolelazzaro.com/the4-keys-to-fun/

16. http://www.nicolelazzaro.com/the4-keys-to-fun/

17. http://www.nicolelazzaro.com/the4-keys-to-fun/

18. http://www.nicolelazzaro.com/the4-keys-to-fun/

19. http://mud.co.uk/richard/hcds.htm

20. http://www.4you2learn.com/bartle
http://matthewbarr.co.uk/bartle/

21. http://www.jesseschell.com

22. http://www.jesseschell.com

23. http://www.jesseschell.com

24. http://www.jesseschell.com

25. http://www.jesseschell.com

26. http://www.digitalplay.info/