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Board & piece skins — all free. Pick any; they're purely visual and never change the game. Your diamonds (◆) are earned by playing and spent in the Roguehouse Foundry. 0
How diamonds (◆) work
Diamonds (◆) are the one currency. You earn them by playing well — each first clear of a Vantage or Manhouse level (and Roguehouse progress) grants ◆ — and spend them in the Roguehouse Foundry. Board & piece skins here are free. Playing is always free and unlimited — ◆ never blocks a puzzle or a game. Your balance is saved in your browser and, when you sign in, follows you across devices.
More on where your balance lives and how ◆ differs from XP — in Help & FAQ.