Made the checkmark drag using UIGestureRecognizer and to dismiss obstacle must drag it into a specified region. A little too precise a region for now, needs work
If you move the check at all it dismisses. Its not pretty but it is stable and functioning.
Merge branch 'master' of https://github.com/hwoodward/MazeGameMaster

Pulled Marjorie's code into mine to make sure nothing conflicts. Marjorie's changes are all to do with the resources.
Adapted Marjorie's code for removing resources after collection to remove obstacles on dismissal. It works.