https://www.reuters.com/article/sea-brazil-focus/singapores-shopee-changes-the-game-in-brazils-e-commerce-sector-idUSKBN2FV067

Sea Ltd's Shopee took just two years to become Brazil's most-downloaded shopping app, winning users to its low-cost marketplace with its game-changing approach to e-commerce: in-app mini-games offering coupons to winning users.