For openSUSE Tumbleweed run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:scala:2.12/openSUSE_Tumbleweed/devel:languages:scala:2.12.repo
zypper refresh
zypper install scala
For openSUSE Leap 42.3 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:scala:2.12/openSUSE_Leap_42.3/devel:languages:scala:2.12.repo
zypper refresh
zypper install scala
For 15.6 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:scala:2.12/15.6/devel:languages:scala:2.12.repo
zypper refresh
zypper install scala
For 15.5 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:scala:2.12/15.5/devel:languages:scala:2.12.repo
zypper refresh
zypper install scala
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/devel:languages:scala:2.12/15.4/devel:languages:scala:2.12.repo
zypper refresh
zypper install scala