"CIO" is a side-scrolling action adventure puzzle game. What seems like an ordinary day, darkness silently envelops the campus, You play as a pupil "Z", using your wisdom and bravery to solve every puzzle, activate every mechanism, defeat every enemy, and ultimately break free from the dark shroud！
Questions
Is it really free?
Yes. CIO is free right now on Steam, with nothing to pay.
Is this the full game?
No. A demo is a portion of CIO — usually the opening section — published so you can try it. It is free permanently, but it is not the complete game.
Where do I claim it?
On the official Steam page. We link straight there — we never host game files or act as a middleman.
More on Steam
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| Ends 31 December 2026 at 23:59 UTC |
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