Easy
Normal
Hard
Very Hard
Impossible
100
Fluffy clouds with a flat bottom
Cumulus 
100
Dark-grey cloud that usually produces continuous rain, snow, or sleet
Nimbostratus
100
Clouds from Planes
Contrails
100
The heavier precipitating clouds, nimbostratus,
Cumulus congestus
100
are stationary clouds that form mostly in the troposphere, typically in parallel alignment to the wind direction
Lenticular
200
Grey Clouds that have a chance of light rain
Stratus
200
a high-altitude, very thin, generally uniform stratiform genus-type of cloud.
Cirrostratus
200
a cumulostratus, belongs to a genus-type of clouds characterized by large dark, rounded masses, usually in groups, lines, or waves, the individual elements being larger than those in altocumulus, and the whole being at a lower height,
Stratocumulus
200
Also called Cirrus filosus is a species of cirrus cloud
Cirrus Fibratus
200
a cloud type named for its tower-like projections that billow upwards from the base of the cloud.
Altocumulus castellanus
300
A cloud that has Heavy Rain
Nimbus
300
small, white patches of clouds often arranged in rows that live at high altitudes and are made of ice crystals.
Cirrocumulus
300
night shining clouds, are tenuous cloud-like phenomena in the upper atmosphere of Earth
Noctilucent
300
a type of cirrus cloud. The name cirrus uncinus is derived from Latin, meaning "curly hooks
Cirrus Uncinus
300
the most common species of the Altocumulus genus of clouds.
Altocumulus stratiformis
400
Wispy-Like Clouds That are made of Ice
Cirrus
400
a middle-altitude cloud genus made up of water droplets, ice crystals, or a mixture of the two
Altostratus
400
also called fractostratus or fractocumulus, are small, ragged cloud fragments that are usually found under an ambient cloud base.
Fractus
400
Cirrus floccus is a type of cirrus cloud. The name cirrus floccus is derived from Latin, meaning "a lock of wool
Cirrus Floccus
400
a cloud type named for its tuft-like, wooly appearance.
Altocumulus floccus
500
Huge cloud that is fluffy at the bottom but flat at the top
Cumulonimbus
500
a middle-altitude cloud genus that belongs mainly to the stratocumuliform physical category characterized by globular masses or rolls in layers or patches
Altocumulus
500
also called Cirrus densus and Cirrus nothus clouds are the highest of the main cloud genera
Cirrus spissatus
500
a low, horizontal cloud formation, usually appearing as an accessory cloud to a cumulonimbus
Arcus Cloud
500
a cellular pattern of pouches hanging underneath the base of a cloud, typically a cumulonimbus raincloud, although they may be attached to other classes of parent clouds.
Mamma/Mammatus
