Enigma - puzzle game
This is one of my favorite computer games ever, that I started playing as a kid when it was installed on the family computer: https://enigma.nongnu.org/. The basic idea is that you have to move around a marble with the mouse and uncover oxyd stones with matching colors. The levels (over a thousand of them) get very challenging and there is a wide variety, from difficult puzzles to levels requiring fast and/or precise mouse maneuvers.
https://yewtu.be/watch?v=GnHOSOly4yE
It is available in the Trisquel repos, but the version is kind of old, and it uses the unmaintained SDL 1.2 which is pretty buggy and unstable in my experience. Thankfully, a new version was recently released that uses SDL 2.0, and it seems much more stable. I recommend compiling from source.
It seems that the Enigma you are talking is different from what I am thinking about.
The "Enigma" I have tried is here:
Oh, I think I have seen that Enigma before. I should try it.
I find it surprising that not many people seem to have heard of this Enigma though. It is a really high quality game.
It looks super hard. I like SuperTuxKart because I can put it on easy level and win every time.
Haha. I like Supertuxkart too. I used to play the original Tuxkart when I was a kid. However, I usually get bored of Supertuxkart after a few days, then come back to it a year later.
Starting version 1.1 or 1.2, the story mode become significantly harder, although you can "cheat" to unlock all maps and karts.
Until version 1.3 (released recently), it is still possible to "cheat". Edit the "player.xml" file and replace all "none" with "best", and you can unlock everything.
I usually don't use the version of SuperTuxKart from distribution's repository. I instead download a pre-compiled binary package for GNU/Linux, and start the game by invoking the "run_game.sh" script.
Rumor has it that STK (story mode) will be fundamentally reworked in near future.
For some nostalgia, you should try the old Tuxkart. It still compiles and runs today: http://tuxkart.sourceforge.net/downloads.html
Sound doesn't work, because it uses the old OSS API, but there is a compatibility layer called osspd that should make it work.
I do keep legacy versions of STK, e.g., 0.8.1, when Sara first appeared. I do prefer the old Sara with ponytail.
In 1.3, Sara looks like an elvish maiden. Her sister Sara the Racer is replaced with Pepper (the heroine of Pepper & Carrot).
It is true that very few people have ever tried such puzzle games, probably because most working people don't have spare time to study them.
The Enigma I mentioned (and its enhanced version Chroma) has features from Sokoban and Lode Runner. Basically, the player has to collect all items without being crushed or clogged by the falling spikes. (I doubt any of its puzzles is truly solvable...)
Here are instructions to install the latest SDL2 version of Enigma. The older version in Trisquel and Debian is fine, but SDL 1.2 is pretty buggy on modern systems, in my experience at least.
$ sudo apt install build-essential pkg-config libsdl2-dev libsdl2-image-dev libsdl2-mixer-dev libsdl2-ttf-dev libxerces-c-dev libpng-dev zlib1g-dev libcurl4-gnutls-dev libenet-dev
$ wget https://github.com/Enigma-Game/Enigma/releases/download/1.30/Enigma-1.30-src.tar.gz
$ echo "ae64b91fbc2b10970071d0d78ed5b4ede9ee3868de2e6e9569546fc58437f8af Enigma-1.30-src.tar.gz" | sha256sum -c -
$ tar xzvf Enigma-1.30-src.tar.gz
$ cd enigma-1.30
$ ./configure --with-system-enet
$ make -j$(nproc)
$ sudo make install