Nimbostratus is a 3D exploration "survival" game. The player controls Nimbus, a small cloud tired of never yielding rain who decides to roam the skies recruiting other small clouds. The game is primarily designed for PC or handheld consoles.

Nimbostratus' main objective is to collect many small clouds, becoming a gigantic cloud that can bestow rain upon lands suffering from drought, earning massive points in the process.

Standing in Nimbus' way are gigantic typhoons in the ocean that viciously try to suck it in, and pollution clouds that threaten to turn Nimbus into acid rain. At the start of the game, only typhoons exist in the map, but as Nimbus ends droughts and allows civilizations to settle in, they expand until they start building massive factories. Ironically, they threaten to destroy their savior.

The map is considerably big and randomly generated, so no game is the same. Time passes incredibly quickly on the surface world, so areas Nimbus saves can eventually suffer from droughts again. The longer the game goes on, Typhoons and factories will be more aggressive and attack in harder to avoid patters.

The player can, of course, upload their high score to compete with other players.