I have very fond memories of playing Wario Land 3 on the Gameboy Color. It really perfected the game loop of progression through the reward of power-ups from defeating wacky bosses nestles inside charming levels. Wario Land 4 however drops all of these fantastic traits bar some catchy music. In its place are bland empty levels that feel disconnected. While the timer mechanic is interested, it ultimately serves to ensure this game is extremely short, and there is little motivation to 100% it.