Sorry for late reply, I was at work and couldn't log in from my mobile (did not realize I need my name, not the email as the username).
Unfortunately, it is not released yet. I need to create one more activity, refine the levels and do some testing and then compile for a number of platforms before release. I'll let you know as soon as that's done, but I will be stuck at work for the next few days so not sure how much I'll be able to do in the evenings.
I haven't actually shown you the level 1 - it looks rather simple, it starts with a 2 piece pattern with 5 repeats (making it 10 pieces long), and then as levels go up the length of the pattern is increased and more items are removed from the chain.
There's also a rather simple way to edit the levels if you need a different behaviour, it's currently not really documented but there is a levels.xml file where you can adjust things for different school years and for each level, or create new levels for that matter. In case of the pattern activity these are the things you can adjust: minimum length of a single pattern term, maximum length of the term, minimum number of repeats, maximum number of repeats, number of fully completed terms, number of partially completed terms, shuffled - if set to True the completed sequences will not necessarily be at the beginning of the chain. The partially completed bit works in a way that all of them together will show the full term at least once, so if 2 of them are used and no fully completed ones with 3 repeats it may, for instance, create "A?C?B????".