Railroad Ink Challenge? is a quick playing roll and write game for 1 to 4 players. Grab a board and a dry-erase marker and get ready to reach networking nirvana! Expand your gaming experience with the super-colored, super-fun, super-crazy Dice Expansions for Railroad Ink Challenge! Every expansion adds a new layer to the game, changing it in unexpected ways and allowing new strategies to be explored and mastered, even for seasoned Railroad Ink Challenge players. Railroad Ink Challenge Dice Expansion Cthulhu Pack. Note: a Railroad Ink core game is required to use the Dice Expansions! Use the 4 special dice of the Eldritch Expansion Pack in addition to your regular Route dice, and find new ways to score points: Ritual (1 die): open new Portals and add mysterious Rituals to create a Madness Network!, Tentacle (2 die): extend Tentacles along your network as much as you can to get bonus points for each space occupied!, and Investigation (1 die): send your Investigator to collect Clues to solve the case and gain extra points!