Dwarf fortress; amazingly complex world simulator where you play as a caravan of 7 dwarves. Do you want to build into the mountainside? Build an above ground fortress from pottery bricks baked from the magma from a nearby volcano? Build a trap that uses that magma in a trap that pumps magma into a sealed room and incinerates the recent elf trading caravan? For SCIENCE of course. Before you pulled the lever on the magma you made sure to steal the giant jaguars the elves had captured to breed and train as war animals for when they invade you next season when they realise what you did to their nations caravan. Train military dwarves in 'Danger Rooms' spear traps fitted with wooden training spears, 'Coinstars' a mechanism that flings thousands of coins at your dwarves, perfect for training the armor user trait, or simply pit them against the captured invaders, wild beasts and foul beasts from the caverns. While the learning curve is more like a cliff persevere and you'll have heaps of fun. Try Dwarf Therapist as a tool to organise your dwarves. Oh and its ASCII graphics