J2blast is a math game that you can play with your friends when you reach 1 thousand points you can unlock a different character and when you get more points you will get even more charectrs . First log in to hwb and click j2e. 
Then you should see J2blast. Like this. 
Click on it .
Then This Will Show.
Then You Click Go Live Where It Sais Click Here Then You Will Be On The Game There Will Show Math Questions Answer Them And At The End You Will Get Points.