Koopaling Confusion is an e-Reader level for Super Mario Advance 4: Super Mario Bros. 3. The level contained five Advance Coins and the Princess Peach e-Coin. This card was released in Series 2 in Japan. Its official difficulty rating is ★★★☆☆. It was originally exclusive to Japan, and only became available internationally when the game was brought to the Wii U Virtual Console in 2016. The key art featured Ludwig von Koopa.
A level similar to that of the battleship level in World 8, the player has to cross over various maritime ships until the player comes to a dock. The player has to choose whether to pick the high route or the low route. The low route leads to a tiny ship at a dock with a pipe, while the high route has the player access a much larger ship from a catwalk above. The player has to fight Ludwig von Koopa at the end of the stage, with the fight depending on the path taken; the low path leads to a level playing field where he goes down after only one stomp, and the high path leads to a more typical contained area with uneven footing, where the usual three stomps are required to defeat him.
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