[heftig]

I had the exact opposite experience. It doesn't teach the basics needed to even solve the first puzzle. Which language are we even writing in? Clicking help explains what exactly to do but not why, as well as lots of rules with unexplained terminology.

[klibertp]

There's a chance it's this: https://github.com/dhilst/algae

[andai]

Interactive thingy here, and a tutorial:

https://dhilst.github.io/algae/