This may be of interest to those with a basic level of English, the free spelling game for Android
https://play.google.com/store/apps/details?id=com.app.spellanywherelite&feature=more_from_developer#?t=W251bGwsMSwxLDEwMiwiY29tLmFwcC5zcGVsbGFueXdoZXJlbGl0ZSJdIs obviously aimed at younger children based on the design, but some of you may find it useful