If you already own the Numbers tiles and Words tiles, you can acquire just the two digital games (Lettertopia and Math Buzz) directly from the App Store on your compatible device: 1) Lettertopia for iPad or Amazon Fire and 2) Math Buzz for iPad or Amazon Fire.
You can also purchase them as part of our Ultimate Expansion Bundle.
You can try out all of our paid apps for free for 3 days; here's more information about that.