I was trying to avoid having to make a tutorial, both to save time and as a design challenge. I was hoping that early levels would do a good job at teaching the player the behavior of the different mole types.
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I'll be the first to admit I'm slower than most (makes me a good tester for worst case scenarios :) ). I was able to understand the mechanic, but I just didn't feel 100% confident that I had grasped it fully. I agree the game should teach the player, it's amazing how much you were able to put together in so short of time.