1. Visit Google.com and click “I’m Feeling Lucky” You can see all the doodles Google created till this time sorted by year.
2. Search Google for
tilt or Askew
3. Search
Do A Barrel Roll or z or r twice
4. Search “recursion” and Google will suggest the word recursion again as you misspelled it, and that search will alos show again the same page
5. Search
“anagram”
it will show you example as Did you mean 
6. Search for
ascii art
and check the Google logo
7. Search google for
sqrt(cos(x))*cos(300x)+sqrt(abs(x))-0.7)*(4-x*x)^0.01, sqrt(6-x^2), -sqrt(6-x^2) from -4.5 to 4.5
8. Do you want to play Pac-man here it is , the logo will change to pac man and you can play using your keyboard
9. Search for
Binary
the
octal and hexidecimal
also works like this
10. Search for
zerg rush
Click on the “O"s to kill, and at the end Google will show your score
