Hexcells Infinite [Steam store page]
While the random-map generation isn't quite as challenging as it should be, I still really enjoy the Hexcells series - they're a modernized Minesweeper.

Minesweeper on steroids - this is a great take on the genre, adding a lot more elements while still keeping a good deductive feel.

Guild of Dungeoneering [Steam store page]
Some of the mechanics are unconventional, but once you learn how to play it properly it's a fun and well balanced dungeon crawler with a twist. It's one of the only rogue-like dungeon crawlers that I actually go back and replay from time to time.

Dead Man's Draw [Steam store page]
I really enjoyed the amount of variety in this single-player card game. There are some really unique card mechanics that keep it fresh and challenging.

Costume Quest 2 [Steam store page]
Better environments than CQ1, with the same great characters. The first level is the only bad part, so suffering through that small grind is worth it.

Corporate Lifestyle Simulator [Steam store page]
This game was originally named and bundled as "Zombies." before being renamed and released on Steam.

I wasn't a big fan of the melee combat, but once you get shotguns and SMGs it makes killing the management a much more pleasant experience.

Needs a faster fast forward, and has a few annoyances if you're trying to get Expert achievements - but the normal gameplay is fun and well designed.

Battle Group 2 [Steam store page]
A refreshing change from normal bullet hell games. You can't steer, your only defense is to shoot down the missiles, planes, and boats attacking you.

The best choose your own adventure I've played - the choices feel important and engaging, and there are enough features that it doesn't feel like a book

For me this game fell somewhere between Legend of Grimrock and Legend of Grimrock 2 - not quite as good as the open-world of the second game, but Vaporum's voice acting made it more of an engaging experience than the original Grimrock.

Quern - Undying Thoughts [Steam store page]
A really enjoyable first-person puzzle game, with unique challenges and an attractive environment.

You may need a game guide now and then, because the island is expansive, but the majority of the puzzles can be solved by logic rather than guesswork. The exceptions are ones where you may not realize a game mechanic is possible.

Battlevoid: Harbinger [Steam store page]
Solid, though the ships aren't really balanced and you have to play/lose repeatedly to unlock new ships before you have any shot at winning.

Furious Angels [Steam store page]
Simple yet elegant gameplay. This is a great example of how to make a game engaging but super accessible.

A survival card game with an interesting concept, but the flawed mechanics make winning more luck than skill-based.

Space Pirates and Zombies [Steam store page]
Slow but solid gameplay, though there are some major balance/difficulty issues - and to counteract those you need to grind quite a bit. The graphics are similar to a space RTS, though you have far less units than a normal RTS.

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