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Multiple choice is definitely problematic in some cases. For example, if you were say, learning chinese, certain chinese characters look very similar. If they happen to be next to each other in multiple choice, you'll probably get confused. Imo it's better to learn and think of them in isolation (perhaps even learning them months apart to reduce the chance of them getting jumbled up in your mind).

thanks for trying it out!

We use a similar spacing algorithm to Anki at the moment but eventually we will use a custom spacing algorithm per person & per card that uses machine learning to learn the optimum spacing algorithm per person & per card

Multiple choice questions are the least effective for memory but they help to keep people's motivation up and make the quizzing less taxing. We mixup the quizzes with multiple choice vs. type-in-the-answer so people are getting the right balance.

fill-in-the-blank vs. multiple choice

free recall vs. recognition

harder vs. easier