On the Underground: Track Extensions

Originally available as part of the 2024 Support The Dice Tower Kickstarter campaign's comet pack.

Setup:
Place the extension tiles that correspond to the colours of the lines in play next to the board.
Extensions are treated the same as standard track tokens - once placed on the board they are part of a player's network and the passenger may move along them.

Gameplay:
A player may spend one branch tile to take an extension tile matching one of their line colours. Doing so does not cost an action.
As an action, a player may place an extension tile on to the board as if it were a track token of the same colour (and under the same restrictions)