I just played "Playing with Letters" and "A Sweet Typing Thrill" in one go and I loved both of them!
For me, the second part was way harder. In the first game, I only cheated on the last riddle but this time the "Rotate" riddle was kinda impossible without help.
I took a lucky guess with the last one (ok, the theme of this part made it easier to guess) and was happy I took notes ^_^
Anyway, I hope to see more in this series!
Keep up the great work!