The brings back many beloved features from the original game, including the elusive secret boss, Culex. Like the original, Culex is not a required boss to beat; instead, it can be tracked down and unlocked optionally. However, tread carefully as Culex puts up a tougher fight than one might anticipate.
Culex will need to be unlocked before Mario and friends can fight him. To reach Culex, the large ominous locked door in Monstro Town must be opened. Once opened, ensure everyone is prepared for a long and difficult encounter. It's recommended to wait until reaching level 20 before attempting this fight.
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Upon reaching Monstro Town, Mario discovers a large black door that's sealed shut. The hidden boss, Culex, lies behind it, but opening it will require Mario to retrieve a specific item that's easy to miss. First, Mario will need to go and purchase Fireworks in Moleville. In the northern part of town, a house with a mole inside sells Fireworks for 500 coins each. For this task, Mario only needs to purchase one set. After that, head outside, where five wooden crates will be off to the right of the house. Here, Mario will need to make a trade with the small Mole standing by the crates.
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She might be hard to spot as she is on the opposite side of the crates, but she's standing where the missing crate would be. Speak with her; she will be willing to trade a Shiny Stone in exchange for the Fireworks you just purchased. With the Shiny Stone, head back to Monstro Town in. Approach the sealed door with the Shiny Stone, and the seal on it will be broken. Note that the fight will not begin immediately uponRead more on screenrant.com