Dungeon Crawl Stone Soup is a game of dungeon exploration, combat and magic, involving characters of diverse skills, worshiping deities of great power and caprice. To win, you'll need to be a master of tactics and strategy, and prevail against overwhelming odds.
Crawl saved games are stored in /home/rogue/.crawl/saves/
Crawl defaults to graphical tiles. To enable ASCII, select "Text terminal" when starting the game. Crawl runs fine on old computers after it is started, but the text version sits at a blank screen for a long time while it first starts up.
You can find more information about Crawl at crawl.develz.org