McDonald's has launched a brand new drink today across all UK outlets - but if you want to try it you'll have to act fast. The Grimace Shake is already a hit Stateside and went viral when it landed in US restaurants last year. The sweet treat is purple and features a blueberry-flavoured syrup blended with a creamy milkshake base. A medium drink will set you back £2.69, while a large version of the shake is £2.99, though prices can vary depending on location. The shake is inspired by the fast food chain's purple Grimace mascot, which was first introduced in the 1970s. The fictional figure was initially an evil character who stole milkshakes from customers. However, he later was rebranded as a more friendly cartoon. McDonald's 1,450 UK restaurants will stock the drink from today, August 28. You can also order it online, through McDelivery, UberEats and Deliveroo, but you will have to factory in delivery costs. If you are keen to try to creamy beverage, you will have to act fast. The Grimace Shake is set to vanish from menus in just a week's time. This means you will have to grab one before September 4. The drink is already a fan-favourite when it hit US stores last year, and went viral on TikTok. It was launched in the US last June as a limited edition menu item and then launched in Canada this past May. The shake is just one of many new menu items set to arrive in McDonald's stores over the coming weeks. The home of the Big Mac is switching up its menu to welcome back its infamous Monopoly game. Players who take part in Monopoly can collect stickers from their food packaging that represent train stations or colour co-ordinated road names - much like the classic game. But not all menu items are worth the same amount, and this determines how you redeem a prize. For example, instant win food prizes can be redeemed at any McDonald's branch by handing the token over at the counter when you order. You'll need to hand the game pieces over to a member of staff when you collect your meal. To coincide with the return of its sticker peeling event a number of favourites are coming back on the menu. These include Mozzarella Dippers and the Philly Cheese Stack. Other popular treats making a return include the Chicken Big Mac, Galaxy Chocolate McFlurry and the Twix Chocolate McFlurry. It will also begin selling a brand new Twix Latte, which features chocolate cream and syrup. The menu shakeup will happen on September 4, when McDonald's Monopoly returns, and will run for six weeks. You might not think it, but you can end up being charged more solely based on the McDonald's restaurant you choose. Research by The Sun found a Big Mac meal can be up to 30p cheaper at restaurants just two miles apart from each other. Meanwhile, you can pick up a Big Mac and fries for just £2.99 by filling in a feedback survey found on any old McDonald's receipt. The receipt should come with a 12-digit code which you can enter into the Food for Thought website alongside your submitted survey. You'll then receive a five-digit code which is your voucher for the £2.99 offer. Make sure you check out all the various apps and platforms if you're ordering McDonald's to your home too. Our research found some can charge up to £1.20 more than others