What flower power-up triggers strange stage changes in Super Mario Bros. Wonder?

What flower power-up triggers strange stage changes in Super Mario Bros. Wonder? The Wonder Flower. Touching one activates a Wonder Effect that can dramatically transform the current level.

The effects are deliberately unpredictable. Pipes may come alive and move, enemies can appear in huge groups, the player character’s appearance or abilities may change, and the stage can shift into an unusual sequence unlike its normal layout. The effect ends when the player collects the associated Wonder Seed or leaves the affected area.

Wonder Flowers are central to the game’s identity, which was released for Nintendo Switch in 2023. During development, Nintendo wanted to revive the sense of mystery and discovery associated with the original Super Mario Bros. Rather than simply transporting players to a new area, the developers experimented with changing the space they were already exploring.

Do not confuse the Wonder Flower with the Fire Flower, Ice Flower, or Bubble Flower. Those are conventional transformation or attack power-ups; the Wonder Flower changes the stage itself.