Roguelike games are a retro treat, hailing back to the earliest computers. They used various ASCII characters to denote dungeon walls and dangerous creatures in an attempt to recreate the experience of playing Dungeons & Dragons.
There are many good roguelikes out there these days on both Mac and iOS with varying amounts of verisimilitude regarding the original game. This type of game typically features a randomly-generated set of dungeon levels so that you never play the same level twice, the idea of perma-death, meaning that once your character dies, the game is over, and lots of treasure, loot, and monsters to contend with on a turn-by-turn basis.
Nightmare Cooperative, from Bad Hotel and Gentlemen! developer Lucky Frame, is a finely-polished rendition of the familiar formula with a few fun twists.
Check out the teaser video below to get a sense of how it looks and sounds.