For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:afisenko/openSUSE_Tumbleweed/home:afisenko.repo
zypper refresh
zypper install amneziawg-tools
For 16.0 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:afisenko/16.0/home:afisenko.repo
zypper refresh
zypper install amneziawg-tools
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:afisenko/15.6/home:afisenko.repo
zypper refresh
zypper install amneziawg-tools
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:afisenko/15.5/home:afisenko.repo
zypper refresh
zypper install amneziawg-tools