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Osmos is a game where the player controls a substance in an enclosed environment, reminiscent of flOw. By touching smaller objects, they can be absorbed, merging to create a larger substance. The substance is controlled through the mouse with a mechanism similar to the classic Asteroids. The mouse is used to choose a direction and gentle clicks, or holding the mouse button, provide acceleration in short bursts, steadily moving the object in a certain direction until touching a border or being slowed down by another object. Moving however causes to leave behind small droplets of fluid, rendering it smaller. When touching an object larger than itself, the player's substance gets absorbed.

The levels are set in enclosed environments where zooming can be done freely. After a few tutorials levels, different paths are offered based on variations on the concept. Some of them are based on aggressively tracking another organism or surviving in a crowded environment, another set is about an orbital course floating around a large object, and the final one is the slowest where there is very little space and the area needs to be captured with caution. In levels with limited manoeuvrability, time can be speed up or slowed down to prevent losing too much fluid when going slowly. Levels are usually won by capturing a specific organism (there are many, with different abilities) or growing to a certain size. In later levels antimatter is introduced, with the opposite effect or regular organisms.

The gameplay is supported by soothing, ambient electronic music.


Osmos Windows Touching a smaller object, it is absorbed.
Osmos iPhone Ah, the odds are looking up now.
Osmos iPhone Getting a little close.
Osmos iPhone The colours of those around you change from red to blue, making it easier to decide which way to turn next.

Promo Images

Osmos Screenshot
Osmos Screenshot
Osmos Screenshot
Osmos Screenshot

User Reviews

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Critic Reviews

Slide to Play iPad Jul 13, 2010 4 out of 4 100
App Spy iPhone 2010 5 out of 5 100
The A.V. Club Windows Sep 07, 2009 A- 91 iPhone Feb 02, 2011 90 out of 100 90
Game Arena Windows Sep 10, 2009 9 out of 10 90
Out Of Eight Windows Sep 01, 2009 7 out of 8 88 Windows Apr 18, 2010 8.7 out of 10 87
IGN Windows Aug 20, 2009 8.5 out of 10 85
Pocket Gamer UK iPhone Aug 11, 2010 8 out of 10 80 Windows Sep 01, 2009 16 out of 20 80


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In order to promote the Linux release of the game, Hemisphere Games offered a free copy of Osmos to whoever wrote about the game on their blog. One of the recipients was Maxim Bardin of Linux Gaming News, who had already purchased a copy of the game. As such, he gave his free copy away as a prize in the first LGN Contest.

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Contributed to by Sciere (384832), Kabushi (162985) and Mark Y (9)