The variant features marbled dark and white chocolate coated wafer on a sark chocolate base, available in a 41.5g bar from March and retailing at 85p.
The brand is also running a “Win a Break from Bills” competition, offering shoppers the chance to win prizes worth £10,000 each, as well giving away £50 every hour from now until 28 March.
To enter, shoppers will need to visit KitKat’s website and enter the 13-digit barcode from promotional KitKat two- or four-finger single and multi-packs, KitKat Chunky single and multi-packs, and KitKat Chunky Duo bars.