The 1825 Extension Kit: G1 is an expansion for 1825, an 18xx game. It includes extra money for use with any of the 1825 Units (useful for those desiring a long game) and is required when paying with 1825 Extension Kit: K3 - Phase Four. The expansion contains 10,000 in the following denominations: 25 x 8 200 x 14 500 x 14 It is not advisable to add the extra 500 notes to an 1825 Unit unless an additional extension kit is in play.Ownership of 1825 Unit 1, 1825 Unit 2, or 1825 Unit 3 is required. - BoardGameGeek