The complete Cuphead game plus the Delicious Last Course DLC typically totals roughly 3.5 GB to 4.5 GB in NSP format. If your .rar file is significantly smaller than this, you are likely missing pieces.
However, based on common distribution methods for this specific title, here is what you should look for: Common File Configurations Cuphead (NSP)(The Delicious Last Course DLC).rar
If the uploader has split the file to meet hosting limits (e.g., 500MB or 1GB limits), the files will be named: Cuphead (NSP)(The Delicious Last Course DLC).part1.rar Cuphead (NSP)(The Delicious Last Course DLC).part2.rar ...and so on. How to Verify You Have Everything The complete Cuphead game plus the Delicious Last
If you try to extract the file using WinRAR or 7-Zip and receive a "Checksum error" or "Unexpected end of archive" message, it is a definitive sign that a piece is missing or the download was interrupted. How to Verify You Have Everything If you
Many sources provide this as a single .rar archive. If you only see one link, you likely only need that one file.
The "piece" or "part" count for a file named depends entirely on the specific source or uploader you are using, as different websites split large files into different sizes.
If the file ends in .part1.rar , you definitely need the remaining parts (part2, part3, etc.) for it to extract correctly.