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About io - The Plot

The Nautilus-114, a rather expensive interstellar research spacecraft now lies marooned in the orbit of Jupiter's moon, io. The status of the crew is unknown.

Now, 5 months later, a recon unit (Norton and Ned) of the Federation One’s IAR team has arrived to study the causes behind the mysterious events and at all costs bring the craft back home. Once aboard they realize that the atmosphere is hostile and that failure is not an option.

The Game

In io your mission is to bring the Nautilus-114 spaceship back home. However, the task isn’t easy thanks to the many robotic minions that now inhabit the ship. In order to accomplish your mission, you have to play evasively (hide in the dark, walk don’t run), avoid detection and carry out your objectives. You are also accompanied by your robotic friend and constant help, Ned. Together, you will take enemies down, gather data pertaining to the destruction of the ships human crew and bring the ship back home (or will you?)

io is a short game much in the spirit of old classics such as John Romero’s Dangerous Dave.

io screenshots

Some perspective.

Remember the good old days when computer games were written by just one guy who sat in his bedroom programmed the game, made some programmer art, recorded some sounds and then packaged and sold the whole thing together as a game.

io is such a game and is made by one such guy from his bedroom, no less. io is modeled after those classic side-scrollers, punctuated with a stealth twist and advanced graphics. io is priced at $13.

Demo download

Download the io PC Demo here. (16 MB)

Download the io Mac Demo here. (20 MB)

Minimum system requirements

io runs fine on Macbooks and Mac Minis with Intel video chipsets. If you are not sure of your machine's configuration, please try the demo. It's just a 20MB download.

Kid safe?

Hmm... you decide. io features -

So what do you think? Download the demo, just to make sure.


Technical features

The io engine is a game development framework for OpenGL equipped PC's and Macs, developed completely for and by atman software. Following are some of the technologies present in the engine.

Real-time lighting


Skeletal animation

Framebuffer effects

Particle effects

Widescreen support

Point and look system

Artificial Intelligence

Other features