Angband is a free, roguelike dungeon exploration game you can download from https://rephial.org, or play right through your web browser at https://angband.live .
And it's open source, so you can even download the source code and compile it yourself. My step-by-step guide to compiling the ASCII version of the game in Windows is on the Angband forum: http://angband.oook.cz/forum/showthread.php?t=11013
The Windows ASCII version I'm running in this video is one I compiled for myself from the latest, version 4.2.3-243 source code (plus my customized title screen):
0:00 - inscription toggle
4:34 - floor 13
13:15 - rogues
28:55 - booty
41:37 - Rod of Light
49:19 - staff stacking bug
59:10 - Orfax, Son of Boldor
1:04:23 - accidental Cygwin ^Z 'p'
1:27:37 - end room ambush!
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