Sea of Treasures Happy Birthday doesn't follow the traditional payline structure. Instead, it uses an instant win mechanic where you match winning numbers with your numbers to claim a prize. The game is set against a vibrant ocean backdrop, filled with symbols like fish, seahorses, and treasure chests. Key symbols to watch for include the Golden Key, Diamonds, and Seahorses, each unlocking different features. The game is designed to be straightforward, focusing on the thrill of unlocking treasures rather than complex paylines or cluster mechanics.

The game's medium volatility suggests that players should be prepared for a mix of wins and losses. While specific bet limits aren't provided, it's wise to manage your bankroll to withstand the swings typical of medium volatility games. Without a bonus buy option, players will need to trigger features naturally, which can extend session lengths but also enhance the thrill of hitting features organically.