I want to use it with older children, is this possible?

Yes, with your teacher's administration tools it is very easy to have children begin Phonics Hero at different levels. This can be done individually or as a whole class by simply selecting which level you wish them to start on. Watch this video to show you how:

Alternatively, they can play the assessment game when they first login to Phonics Hero, and this will place them at the correct level according to their ability.