Is great the concept of magnetic platforms, but there are times that it costs a lot to use them well to be able to move forward, or just not working correctly.
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Level 5 has only one magnet and no matter what you do, you can never go any higher to reach the top platform.
The concept is interesting but the game still needs polish. I could critique the game but I assume that you've moved on from this one? If not, let me know.
As for what magnets didn't work correctly, I can't tell because to me they worked as they should.