Here is the App Store link to the Toybox app:
Here's the Amazon link to the Toybox app for Fire devices:
Here's the App Store link to the Genius Kit bonus bundle (including two games, Osmo Numbers Toybox and Osmo Words Explorers):
The game is available in all geographic locations on both the App Store and Amazon and works on all devices that Osmo supports.
Note that it requires the Osmo Number tiles and the Osmo iPad or Fire base to play.