All 50 states, state on the front, capital on the back — the classic social-studies memorization unit, ready in one click. Shuffle mode is the honest test: alphabetical order leaks answers.
The Ones Everyone Misses
The pattern in every classroom: capitals that aren't the famous city. Nobody misses Boston or Denver; the deck earns its keep on Olympia (not Seattle), Salem (not Portland), Albany (not NYC), Springfield (not Chicago), Jefferson City (not St. Louis), Carson City (not Las Vegas), and Tallahassee (not Miami). When the deck is nearly mastered, edit it down to the stubborn dozen and drill the short stack.
Flip the Drill
Test both directions: state→capital is the school quiz, but capital→state is harder and produces stronger recall. Study the deck through once normally, then use the back as the prompt. For a two-player version, share the link — one phone quizzes, the other checks.