"Exile" and "Revelations" were the third and fourth installments of which PC game series?

Exile and Revelations were the third and fourth installments of the PC game series Myst because they continued the immersive and mysterious world-building that the first two games established. In these sequels, players were once again transported to captivating and visually stunning environments, solving intricate puzzles and unraveling the deep lore and narrative of the Myst universe. The games remained true to the original franchise's signature gameplay mechanics, combining exploration, problem-solving, and atmospheric storytelling to create a unique and unforgettable gaming experience.