SD: http://www.ign.com/prime/promo/kingdomrush-iphone HD: http://www.ign.com/prime/promo/kingdomrush-ipad
Compatible countries: United States, Algeria, Armenia, Australia, Austria, Bahrain, Belarus, Belgium, Canada, Chad, Denmark, Egypt, Finland, France, Germany, Hong Kong, Indonesia, Ireland, Italy, Jordan, Kazakhstan, Kuwait, Lebanon, Luxembourg, Malaysia, Netherlands, New Zealand, Norway, Oman, Philippines, Portugal, Qatar, Russia, Saudi Arabia, Singapore, Spain, Sweden, Switzerland, Taiwan, Thailand, Tunisia, Ukraine, United Kingdom, Vietnam
I don't believe the HD version has been offered for free before. Hard not to snag that, so I locked in the HD license.
I should check to see if I have the HD one. I know I acquired the regular version free a while back though.
To anyone interested there is a sale on most or all of the IAP in KR: Frontiers as well, I think. I'm not really into KR or IAP. Just noticed that in a news feed though. Passing it on.