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 except iPhones.
Note that it is $9.99 USD, and requires the Osmo Words game pieces, the Osmo Number tiles, and the Osmo iPad or Fire base to play (it doesn't currently work with iPhones).