Easy and compact Selector

Another Minecraft design came up in my mind: This is an easy selector, which can be used for changing the difficulty for example. The Size is 3x4x? (adjustable), though there is one flaw: Without special improvements it can only hold up to 15 buttons. Shouldn't be a big problem, but just keep it in your mind when building something very big. Design is not by me, saw this already somewhere else, but can't find it anymore :P

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