Your Dreams Live is an online crowd-based game that allows people to pick their own prizes or "dreams" that they and others can bid on and win.
The company, based on the Isle of Man, chose Brazil to develop the strategy, launch and ongoing PR, social & digital activities ahead of its imminent launch.
Brazil won the work in a competitive pitch and there was no incumbent agency.
The agency said it would use its consumer expertise to develop a strong brand message to deliver on its brief.
Joshua Van Raalte, chief executive of Brazil, said: "Your Dreams Live is a truly original idea, and it will shake up online gaming. Consumers increasingly want to be in control and to express what they want. Your Dreams Live is the only game that caters to, and lives by, the real dreams of consumers. We are excited to be a part of the revolution from the beginning."
Fanch Le Bris, founder of Your Dreams Live, said he regarded Brazil as an "integral" part of introducing the game to the market.