Here is my crack for version 0.18.0 of Seaside Mystery.
After launching the game and it finishes loading to the main menu, it should automatically do everything and say "Account Linked" in green. You can now save and load games as usual.
Do feel free to
@Me if any game updates come out and the crack doesn't continue working, or some other issue with it.
There is a more detailed readme.txt but it is quite self-explanatory, basically just put the .dll file next to the game's Seaside Mystery.exe file and it will work automatically.
CRACK ZIP PASSWORD: TJ888
(Use winrar or 7zip to extract it using the password TJ888 and do not use the built-in windows extraction tool as you cannot enter a password)
Edit: For anyone wondering why I need to password protect my crack now, it is because VirusTotal has implemented a new AI detection called "DeepInstinct" which is falsely flagging my cracks as malicious which as a result causes F95Zone to flag it as a virus. Password protecting the zip avoids it being scanned by DeepInstinct allowing it to not be false flagged as a virus.