[] missing-letter
[] guesscount
[] click_on_letter (and click_on_letter_up)
[] lang
[] readingh (and readingv)
[] letter-in-word
[x] digital_electricity
[] bargame (and bargame_2players)
[] note_names
[] superbrain
[] solar_system
[] piano_composition
[x] number_sequence
[] balancebox
[] hangman
Note that this list does not check the subactivities if there are!
Then probably move the DialogActivityConfig to activities/menu as it is the only use case we'll have