Chronigma (AppID: 4051150)

Who is this made for: Gamers who love hard-core time manipulation puzzles. 

Story: They called it the Time War. A conflict where humanity's greatest achievement, time travel, became its tombstone. Your father (Kronos) has dedicated his life to one purpose: your (Cygnus) training. This puzzle adventure is a series of his lessons (puzzles), and each one a challenging test of your ability to manipulate time. 

Game: This is a single-player, story-rich, time-bending puzzle game. You use time travel to be in two places at once to solve increasingly complex puzzles. With the Chronigma device, you are never truly alone. The Chronigma device records your actions, allowing you to travel back in time, and team up with your "Past Self" to solve puzzles impossible for a single person.

Key Features

• Completely free game.

• Time Manipulation Puzzle Game: This is a difficult puzzle game and is meant for those that enjoy time manipulation puzzles.

• Team Up With Yourself: Record your actions and collaborate with your own
  "Past Self" to overcome obstacles.

• A Journey Through Time: Explore 50+ handcrafted levels, from simple logic problems to multi-layered temporal challenges. Providing over 4 hours of mind-bending puzzle gameplay.

• Play the Game Your Way: Stuck on a tricky paradox? Get a nudge in the right direction with in-game hints, or skip a level to come back to it later. You can also unlock all levels to explore the story at your own pace. And if for some reason you are not interested in the story, you can disable the dialogue in settings. 

• A Story of Hope at the End of Time: Uncover the secrets of the Time War and the heavy burden shared between a father and son, training to save a world they've never known.

• Bonus Challenge: For the truly dedicated, seek out and conquer difficult levels that will test your mastery of time to its absolute limit.