toppler(6) on Linux
The text 51a9a71f5672, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch) shipped it.
clone of the old "Nebulous" game
Flags it lists
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-dNUM -
-f -
-h -
-s