Unpopular opinion: The "Play" feature questions are terrible
The game aspect of SoloLearn, where you are given a programming question and you need to type in the right answer, is absolutely terrible. Look, the concept is great, if the questions were actually of good quality. Most of them are stupid, it's mostly just some form of loop that modifies some array or some variables and you need to guess the output, which is usually hard to do in your head especially with the time constraint. Or questions which use functions like Python's zip and map etc. these are all terrible. They're not even programming questions anymore they're just tests on how many numbers can you keep track of in your head in a limited time. I'm honestly glad the Quiz Factory got removed because the questions people sent in were garbage, and not worthy of being called programming exercises.