What do the difficulty levels mean?

The difficulty level controls which times appear on bingo cards and get called during the game:

• Easy — Hours and half hours only (1:00, 1:30, 2:00, 2:30...). Best for kindergarten and early learners.
• Medium — Quarter hours (1:00, 1:15, 1:30, 1:45...). Good for students learning quarter-hour concepts.
• Hard — 5-minute intervals (1:05, 1:10, 1:15...). Aligned with 2nd grade standards (Common Core 2.MD.C.7).
• Expert — Any minute (1:01, 1:02, 1:03...). A real challenge for advanced students.