Train Valley; it sounds as Geeky as it is, a Train puzzel simulator game.
Last played somewhere in 2017, I was a total train addict, I love mind numbing, puzzel, strategic games.
At first you think Easy peasy Lemon Squeezy, but of course chaos arises as you go level up.
Every level is repetitive, but the difficulty increases (duh), there is definitely a challenge.
Train Valley 2 and Train Valley world are the sequels of the game, didn't play them, but I don't think they will disappoint.