Today's Free App of the Day is Puppet Rush
Not very well reviewed; mostly because of the use of the Adobe Air framework but a couple more reviews complain about gameplay.
2 of 6 reviews are four stars and above.
So we have a bonus pick: XE Currency.
XE is one of the top currency sites and their app for the Kindle Fire devices is very well reviewed. 7 of 9 reviews are four stars and above.
These apps are compatible with the original Fire and with my Fire HD 8.9" 4G. To tell if an app works for your Fire HD or other Android device registered to your Amazon account, click on the above link and look on the right side of the web page. Amazon will tell you if it will work with your registered device.
Also check out the other digital deals from Amazon, including great deals on MP3s and videos: