Terraria is today's Xbox One Countdown to 2015 deal, which invites console owners to a magical world of exploration, adventure and awesome houses. Terraria is currently on sale for both Xbox One and Xbox 360, enabling folk who have yet to immerse themselves into the block-filled world to pick up the title.

Both versions have 40% off the asking price for today only:

As well as today's Xbox deals counting down to 2015, Lego is going on sale for all Xbox owners. Here are this week's offers for Gold Subscribers, available now through 5 January 2015:

Xbox One

Xbox 360

Source: Major Nelson