Pithvein: idle mining

A factory of living tissue, dug into the rock beneath a city that does not know it is there. Each chamber grows an organism that makes pulp. You squeeze whatever you want to yield more, and every squeeze starts a clock the game shows you outright: six hours, then a little over two, then under one. Up to the safe level nothing happens and the factory runs on its own, even with the game closed. Above it, you bought time, and you know how much. THERE IS NO BURST YOU DID NOT SEE COMING. • SIX BIOLOGIES, ALL OPEN Nodule, polyp and moss yield by scale. Lichen never sickens and gains nothing from neighbours. Carrion yields per sick neighbour and starves in a clean factory. Waspnest yields a lot and clears itself when it bursts. None of them is bought. • GROUPING IS A TRADE Each neighbour of the same crop gives more output and takes away one step of slack. Where you plant matters as much as what. A nodule between two of its kind has no slack at all. • PURGE OR GRAFT When a chamber bursts it stops and poisons its neighbours. Purging clears it and loses everything you invested. Grafting tames the mutation into a permanent bonus for the neighbourhood, but a permanent flaw comes with it. The choice is yours and there is no undo. • THE LAB Samples come from what the factory loses: purging a necrosed chamber gives one, grafting gives two, and nothing else makes samples. With them the lab researches twelve strains, versions of a crop with a different trade between yielding and holding. The first one costs a single sample, so one purge already pays for it. • DIG DOWN AND EXPORT Twelve floors, each costing four times the last. When the factory is worth it, send the shipment up: it starts over and the genome stays, with permanent upgrades you pick. • IT PLAYS ITSELF The factory produces for up to eight hours with the app closed. Come back whenever you like. Before you leave, set the risk to match how long you will be away: the menu tells you until what time the factory holds, and when you return the game tells you what burst. NO ADS. Plays offline. The game only talks to Google Play: to check and make purchases and, just once, to ask for a review. Google Play handles the payment. The whole game is free: all six crops, all twelve floors and prestige. The store holds three tips (a coffee, a lunch, a dinner) and none of them changes a line of the game. Single player. Plays with no internet.