Unless sedtris will have some install instructions :-)
Please let em know which others shell instructions you like to be added

Why would anyone need installation instructions for a shell script?

You can ask to the issue #2 creator :-)

sedtris

This is a Tetris clone written in Stream Editor commands.

To run, git clone the repository or otherwise download sedtris.sed and optionally sedtris.sh. sedtris.sh is just a wrapper written in Bash shell for sedtris.sed to make sedtris more comfortable to run.

After cloning or downloading+extracting sedtris, run the file in bash: bash sedtris.sh. There's no reason to install a simple Bash script, but you can certainly do so, just chmod +x sedtris.sh && sudo cp sedtris.sh /usr/bin/sedtris && sudo cp sedtris.sed /usr/bin/. This is untested and not guaranteed to work. You can also user-install sedtris by placing the files in a folder in your home directory that's also in your PATH environment variable, provided you use the Bourne shell or similar.

Feel free to use this without credit.