Technically, tentacles are a limb with one suction cup on the end. 

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Octopuses have been found to have sophisticated problem-solving abilities, such as being able to open jars and solve mazes

The Dana Octopus Squid is a rare 7-foot squid with two tennis ball-sized organs that light-up

Image of a glass octopus

Glass Octopuses Switch Between Transparency And Pigmentation For Camouflage

Octopuses change color and shoot ink to avoid predators

Gloomy octopuses will throw things when their personal space is invaded

Blanket Octopuses will rip off their penis for the female to use alone