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The recently released Baldur’s Gate 3 can be played with one hand perfectly fine. Your arm will likely heal before you finish it.

Edit: just noticed that you said you want keyboard only, in which case BG3 might not be ideal since it’s mostly mouse based. I think you can customize it to play with keyboard only since it has gamepad support, but don’t know what that’d be like.

There’s no fast paced clicking required though, so you could try to adapt to left handed mousery if you really want to play that one.

Baldurs gate 3

Dead or Alive Beach Volleyball Xtreme 3

If all else fails, Vampire Survivors.

Slay the Spire and Monster Train are great singleplayer card games that can be played with just the mouse.

Pretty much any turn based RPG is on the table, I can easily recommend Octopath Traveler 2.

You can also play story-driven games like Telltale games and Pheonix Wright, those are pretty fun.

Cannot view the link without signing in, but Peglin can be played with just the arrow keys and space bar as the minimum amount of keys needed. I cannot say whether WASD works, but it’s pretty simple to play.

Almost Any visual novel.

Slay the Spire and Darkest Dungeon can be played with only a mouse and you don’t need any reaction, maybe when you configure the overlay in the settings for the games it’s then playable with only the keybord. Maybe you can also play Dredge in the passive mode with only one hand and only keybord I havent tried it out with this restriction

Caves of Qud is a really neat turn based roguelike that kinda focuses on exploration. It’s a bit hard to get into but if you do it’s really neat. Very very keyboard friendly, its my go-to game on my laptop.

It has difficulty modes that are… Less hard lol

One Finger Death Punch

Anything that is turn-based will work really, or doesn’t rely on a real-time mechanic.

I do suggest looking at a small trackball that you can use in the meantime. It’ll be useful for the times when you need a pointing device in a smaller space, for whatever reason.

I recently enjoyed playing yet another zombie survivors and it was a blast, cheap and at least a weeks worth of grinding to unlock all the goodies. Also you only need the WASD keys so you should be set with your broken arm.

I know you said your right arm is broken, but The 7th Guest (and the sequel, The 11th Hour, but the puzzles are very difficult) would be easy to play with your off-hand mouse anyways

just make sure you use ScummVM for them, because the versions that Steam/GOG are selling aren’t very stable

similarly, the first 3 Monkey Island games, or Myst/Riven

If you are into VR, Beat Saber has some one-handed songs and Pistol Whip is mostly one-handed. The exercise of playing those games improves overall circulation which helps the healing of fractures.