MarsSeed [1] filed a deletion request for seahorse-adventures [2]: Broken VCS package in disguise. Upstream is EOL since 2014 and the GitHub repo is archived. [a]
Also dependency 'python2-pygame' is broken since mid-2023 due to API/ABI incompatibility with portmidi. [a]: https://github.com/Nebuleon/barbie-seahorse-adventures [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/seahorse-adventures/
