Best map/way to farm Tunnel Achievement?

[Vaelana]

Pretty self explanatory. I wanna finish the achievements as quickly as possible. I tried Rio and Mexico both but they both only gave 2-3 each even tho i used like 4-5 tunnels on each.

Also the infinite tunnels from weekly challenge obviously doesn't work before anyone mentions it.

[martyyyn]

What did you do in the end?

[JVC]

Originally posted by martyyyn:

What did you do in the end?

I think OP might not have completed the tunnels. They counted for me but only if the tunnel both begins and ends on a valid tile outside of the mountain. I farmed them on the two maps with the mountains. If you can get a daily challenge with extra tunnels that might work even better. The weekly challenges didn't work.

[Vaelana]

Originally posted by martyyyn:

What did you do in the end?

I played Mexico City repeatedly, only aim was to just build tunnels. Obviously i couldn't do/undo and do again. I needed to have earned it from weekly rewards so i need to progress a bit but since aim is just to grind it out. I didn't care about longevity of city.

TL:DR: Repeatedly play Mexico City to fail but get tunnels.

[Aryptonix]

For me, I used Rio because you start with 1 free tunnel.
1. Link the first color with a tunnel
2. Let 1 car go then close the path. If its far, let 2 go but its rare
3. Afk until the first reward and hope its a tunnel (jackpot)
4. Let the first color fail and restart

Its boring but was like 25/30 tunnels an hour (depending on your luck). Suck that the achievement needs 100 tunnels when only a few maps can even make tunnels. Oh well, im done now. If you got a faster way, share it!

[GreenGrinch]

in case anyone finds this and is wondering...the challenge mode in mexico city gives you unlimited tunnels...i used 14 in one run but was only given 5 towards the achievement, i think maybe they need to be a certain length to count since a lot of the tunnels i made were really short (to try and make as many as possible). Good luck

EDIT: Tested and it works! If the tunnels are long enough they count, so depending on how long you can keep the run going you can get 10+ per run