Often, the initial release (v1.0.0) is buggy. Nintendo released Update 1.0.1 in February 2025, dedicated entirely to bug fixes. If you are playing a pirated copy, find the "Update" NSP file (v1.0.1) and install it. This official patch fixes specific progression blockers, such as:
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The "fix" part of your search query suggests you've already downloaded a cracked or pre-release copy and it is broken. This is an extremely common issue with Mario & Luigi: Brothership for several reasons. Often, the initial release (v1