1825 Extension Kit: K1 - Supplementary Tiles is an expansion for 1825, an 18xx game. It contains: 8 Green Tiles: one each of 17, 18, 21, 22, 28, 29, 30 & 31 7 Russet Tiles: one each of 39, 40, 41, 42, 43, 44, 47 Ownership of 1825 Unit 1, 1825 Unit 2 or 1825 Unit 3 is required. - BoardGameGeek