If it says 'WebGL is not supported' tap ok and it should work.
How to play Alien Attack
1) Choose your times table.
2) Player 1 click on the die.
3) Times the number on the die by the times table you are learning.
4) Find your alien with that number on it.
5) Click on the alien to zap it.
6) Player 2 now do steps 2 to 5.
7) Carry on until all your aliens have been zapped.
8) Finally go for the alien boss - hit it twice to win.
(If you've already zapped an alien, end your go.)