Super Mario Bros. Wonder is a 2D side-scrolling platformer developed by Nintendo EPD Production Group No. 10, released in 2023 for the Nintendo Switch. Players progress through courses collecting Wonder Flowers, items that trigger dramatic, unpredictable transformations to each level — pipes may animate and move, waves of enemies can flood the screen, or characters may take on entirely different appearances. These Wonder effects vary from course to course, making each stage distinct in its surprises. The playable roster expands beyond the series' traditional lineup of Mario, Luigi, and Toad to include Princess Peach, Princess Daisy, and Yoshi, giving players a wider selection of characters than is typical for a mainline 2D Mario entry. The Wonder Flower mechanic serves as the central design pillar, reshaping familiar side-scrolling gameplay into something consistently unpredictable.