Ohh No is the most challenging number puzzle game that tests your brain abilities.
http://www.keenuapps.com/
Unblocked Games
seppo.karjalainen
http://www.neonbluegames.com/
https://pickergame.com/
http://xubala.com/
https://724fun.com
http://www.4nums.com/challenge/
MaggieDev