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Kingdom Rush Origins, the prequel to mobile's greatest tower defence franchise, is on sale right now for 79p / 99c (down from £2.29 / $2.99 on iPhone and £3.99 / $4.99 for the HD variant.

For the uninitiated, you're challenged to take down waves of enemies by placing towers in strategic locations.

You can upgrade your towers to improve their damage and protection, as well as give them new abilities entirely.

At review, we gave it a Silver Award and described it as "A polished and brilliantly balanced tower defence game, Kingdom Rush Origins has enough content to keep you entertained for hours."

Head on over to the App Store to get Kingdom Rush Origins for iPhone [download] or iPad [download] right now.

Want more? Check out our growing collection of Kingdom Rush Origins articles!