by Metal Rat
The iconography of the player board is explained on p.6 of the rulebook:"3. Steel: Is only used to pay for cards with a building tag and is worth 2 M€/cube. You may pay with both M€ and steel, but you get no refund for 'overpaying' with steel.
"4. Titanium: Is only used to pay for cards with a space tag and is worth 3M€/cube, similar to steel [i.e., you receive no "change" when overpaying]."









