Deadly Rooms of Death might be one of the best games ever made. What just looks like "Sokoban with a sword" has revealed itself to me as a game that makes me feel like a fool right before making me feel like the smartest person to ever exist.
The gist is, you are a guy tasked with clearing dungeons of monsters. You can choose to move one square in any of the eight directions, or choose to rotate your sword clockwise or counterclockwise. Either choice counts as a turn, and when you take a turn, so do the monsters, typical turn-based stuff. This simple moveset can lead to some deceptively tricky puzzles, but the best part is, unlike Sokoban wherein if the solution to a puzzle is rigidly "up, right, right, down, right, up, up, up" and if you mess up even a single move you have to start the whole room over, so far DROD is relatively jazzlike. If it's just you in a room full of roaches, you can approach how to kill the roaches in a variety of ways.
Borrowing from a Let's Play of the first game for a moment, there's a room in level three where you're tasked with clearing few dozen roaches that all enclose on you from the perimeter of the room once you let them free, but the protagonist, Beethro (fully voice acted!), mentions in passing once you enter the room that he can dispatch of the roaches without turning his sword even once.
There's several ways to clear this single room, whether you decide to follow Beethro's boast, or if you can't figure it out and decide to turn the sword. Not only that, not only was I able to clear this room without turning the sword, but the player in the video above did so in a completely separate way than me, and watching back my own solution and his, there's room for optimization.
I only discovered this game series a week ago and I'm already hooked. This game took the Sokoban formula and hammered the rigidity out of it while making it more of its own thing than even Chip's Challenge did. Like Chip's Challenge's medieval brother.
The games all have free demos on the developer's website but they're also just cheap on GOG and Steam.