Oh is this game fun!
There is a practice activity where b, d, p and q get put away in their correct kitchen cupboards.
Then two players can compete to build the best looking cake by tapping the correct letter (choose b, p, d and q) and the fast pace makes for great drilling.
Two kids focusing on different letters can till compete, choosing their own letter or "cake."
The sound effects are slightly annoying now, but not to A5. He finds the bakers comments hilarious. And he's improved the Dd/Bb reversal in a short amount of time.
Search for BD Bakeoff By Teacher Tipster in the App Store. These strategies from All About Spelling can also help. His big brothers use AAS. Even though A5 isn't ready to begin All About Spelling level one, their website is a terrific resource for free articles and ideas about common spelling and reading struggles.