The maze represents your path through all the modes and levels in the game. You can play levels that are unlocked anytime. Some levels may display a padlock icon; you need to unlock these levels first to play them. They can be unlocked by playing earlier levels that are connected to them by dotted lines.
The level navigator in the new version of Osmo Numbers takes you through 50 levels, divided into four geographic regions.
Find more information in our PDF guides to Osmo Numbers and Osmo Numbers Education (the original version of the app):