week 4, still no extra tunnel
i tihnk the game thought the whole north shore is one whole piece and doesn’t need more tunnel.
Use a relief line to overcome the time until you get a tunnel extra.
If you connect the right Triangle and Circle station, you just have to vent Blocks and specials out now and then.
The other temp line could be the Circle on the left, into the cross @ the triangle, since from there 2 lines go into Blocks and the special can be reached on the green line.
The way the maps are (mostly) built is that you start with one crossing per each river / waterway that you will need to cross. That way choosing extra tunnels is a choice rather than a necessity.
However as you’ve seen, that’s not always the case! Depending on the order in which the stations appear on the map you’ll need additional tunnels to connect stations on the same side of a river. As @jasperwillem said you can use temporary lines to swap between them until a station appears that allows you to connect them without using a tunnel. It’s just how the cookie crumbles. We could prevent stations from spawning in this position, but that will rule out a lot of potential city configurations; the city generates all positions before the game begins so it has to assume the player has no extra tunnels, and we don’t want to alter the city generation in response to asset choices anyway (especially for the daily challenge).
The exacerbating factor is the asset choices you’re presented with are random as well. If you’re completely out of tunnels it does increase the odds tunnels are present to 90%, but nothing’s ever guaranteed. Perhaps we should guarantee a tunnel choice after two consecutive weeks of zero available tunnels?
The game sticks to the ‘you’ve gotta have stuff that sucks to have stuff that’s cool’ approach. If you have an “unfair” map like this one, then it makes you treasure those games when you get a square station on both sides of the river all the more.