In this game you're a mole who collects gems underground with a mechanical arm. You can move the arm one step in any of the 4 directions. When the arm touches a gem, it collects it. The problem is that you can only collect gems in groups of 3 where they all must be of the same type. You cannot pass again where your arm already is, so you need a good plan to collect gems of the same type one after another ad be able to collect all gems in the level.
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