@ownageburst Tukkun has said multiple times he will never add a coin exchanger, as that would take out a large portion of the game. Blue coins are meant to encourage anti-idling, red coins are to encourage suggestions/bug reports and achievements, and to exchange them would ruin the point. Besides, green coins can buy a lot more than yellow ones, and you should have to pay a unreasonable amount of coins to get them.
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