How to play Alien Addition:
Use the mouse or keyboard to move your spaceship, and shoot the correct answer!
When you get to the "Options" page, change the content range from 12 to 20, so that you are practising your number bonds to 20.
What score can you get? Check the list of top scores to see if your name is listed.
How to play Minus Mission:
This is a Space Invaders type games with subtraction sums to 20. Are your subtraction skills as fast as your addition skills?
In the "Options" page set the number to 20, and start firing at the slime blobs using the mouse or the arrows/space bar on your laptop.