The game Every Word is available for the Kindle. It is a game specifically made for the Kindle and not other devices. The game can be purchased off a site such as Amazon.
Yes, you can read Kindle books on your computer by using the Kindle for PC application. This application allows you to access your Kindle library, purchase new books, and read them on your computer screen. You can also sync your progress across devices, so you can seamlessly switch between reading on your computer and other Kindle devices.
No
No. Both Kindle devices are 7" (seven inches).
download the text+ app
On a Kindle Fire, the closest you can get to texting is through AIM, which you will need an email account for. download the app text+
Direct quote from Amazon's web-site - relating to the Kindle's file-handling capabilities - "...Email personal documents and PDFs direct to your Kindle to read and annotate on-the-go..."
Yes, Instagram is now available at the Amazon App Store and for Kindle devices.
Yes, Tetris has apps for mobile devices. Tetris can be downloaded for andriod phones, kindle fire as well as other mobile devices. Sometimes it can be downloaded for free.
It was only Apple devices, but it was recently also added to Kindle as well.
With Text-to-Speech, Kindle can read English-language content out loud to you.
Yes, Instagram is now available at the Amazon App Store and for Kindle devices.