XLander is a 3D wire-frame lunar lander clone. The game keeps looping after each successful (or partially successful) landing so you can earn a high score based on your landing combo. As soon as you crash, the game immediately exits and reports your final score to the terminal.
XLander was written by Paul Riddle and Mike Friedman and originally tested on Ultrix and SunOS. The date from the manual page is 27 April 1992.
The following is a video showing a single successful landing:
It can be found in the Debian Archive, in the x/xlander folder. It hasn't been included in a while, though.
By default, the game does not account for faster processors and will run WAY too fast. Maybe an original Model Pi would be fine, but for anything else, I've created a patch to add a usleep() statement which forces it to around 20 fps. This gets it much more playable, and is what the video above is using. Beyond that simple patch, the old code still builds on my modern machine.
More general information on old X games, including build tips can be found in the Old X Games article.
If the above video does not work for you, it is also available on my YouTube channel.