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The Plan

Microcosmos Fly Simulator: off the ground and into the light, let the small creature ascend. Danger, plot twist, dramatic music and a hidden bonus all condensed into a majestic freebie.

Shadwen

Guide your defenseless little sister to safety in this medieval stealth game. Shadwen can sneak, stab, climb, grapple, create diversions and lay mortal traps to move guardsmen out of Lily's way - but she must remain unseen. Time freezes whenever you release the controls so you can look around to evaluate your stratagems, chain actions efficiently, and rewind to undo a blunder.
Trine developer Frozenbyte released a demo level for free with the promise that the full game's price would drop according to the community score at the end of the event.

Hitman (2016)

The sixth opus in the stealth-action series sets out to reconcile recent additions like Contracts Mode and challenges with the sandboxy openness of earlier games.

Devil Daggers

A bare-bones throwback to a darker, faster era of FPS - or is it a wishful vision of how cool 90s arena shooters could have been ? See how long you can survive the mumbling, stumbling hordes spewing from the abyss and share replays with other players on the leaderboards.

Lifeless Planet

An international team of astronauts embarks on a one-way journey to a distant planet reported to be Earth-like, intact and lush with life... If only they had read the title. Developed by a one-man studio helped by a modest crowdfunding campaign, this third-person adventure consists mostly of light puzzling and jumppack-assisted platforming across atmospheric scenery. Following the game's release on consoles, the PC version was patched to a Premier Edition in late July, 2015. Among other changes this free update saved the picture from stretching on wider-than-HD displays.

Californium

" Explore the worlds of Californium, a first person exploration game where you are a writer trapped into shifting realities. Will you find what’s behind the simulacra ?" - Steam store page

Unravel

A different kind of ripping yarn. Little thread devil comes to life, explores the neighbourhood and collects memories of its human family. Set in rural Sweden, this side-scrolling puzzle-platformer tells a moving story with fancy graphics, delicate music, and without a word.

Firewatch

Two Forks, Wyoming: come for the solitude... stay for the mystery. The story of a middle-aged man settling in a fire lookout tower for summer, told in snippets of hiking and chatting over the radio.

XCOM 2

They have won, and they're not done. In the years following XCOM's desperate attempt to rid the sky of rogue UFOs, humanity was forced to surrender to the alien invasion army. Some still refuse to submit and join the remnants of the organization... The sequel to 2012's "X-COM re-imagined" is a PC-focused title shipping with official modding support.

Underrail

No map or fast travel in this isometric RPG with turned-based combat. Underrail values exploration so much that the default progression system relies solely on finding special items (called oddities) instead of piling up experience points for every critter killed or quest completed. The game is not shy on dialog and characterization, but its heart beats for combat, crafting and the endless possibilities of stealth, brute force, traps or psychic warfare in a subterranean wasteland rife with loot and danger.