Basic:
https://studio.code.org/flappy/1
This is a mostly a beginners site but has lots of different games and courses to try out. It caters to all age groups (including kindergarten) and has the greatest variety of things to do.
Also Try:
Minecraft Adventure:
Minecraft Designer:
Star Wars:
Make Pong:
http://lightbot.com/flash.html
This game is moderately harder than code.org. Programmers need to guide a the bot through a maze to light up certain points in the map. This is a nice introduction to order of operations, and using procedures.
Super Easy:
This website has more fun and creative programming games and applications, such as music makers and a kaleidoscope maker
http://spritebox.com/flash.html
Much like Lightbot, however it has the option of using text coding instead of graphics. It can be quite fun.
In the early levels there is a emphasis on fixing code that is already broken as a way to teach kids how to fix broken code.
Code Monkey
https://www.playcodemonkey.com/challenges/0
Math:
Tiny King:
http://www.abcya.com/tiny_king.htm
Digital Citizenship
https://beinternetawesome.withgoogle.com/en_us/interland