Finally, the holiday everyone looks forward to is here: World Octopus Day!

PlayMonster celebrates octopuses all year round with the game Stacktopus so, of course, it wants to get in on today’s celebrations. It’s inviting families to share funny photos on social media with #SillySeaFingerChallenge and show off what they can do with the Stacktopus Silly Sea Fingers.

In the game, players use the sea fingers to grab and stack colored cups to match designs on colorful cards. It’s a lot more difficult (and sillier) than it sounds!

Related: Stacking Gets Silly with Stacktopus

According to PlayMonster, octopus fossils date back to more than 300 million years ago, which makes them older than dinosaurs. Experts believe it’s because of the 500 million neurons in their arms and brains that make them extremely intelligent. It’s also possible that silly things just last forever.