Video games

"Nite, listen... video games? They're REAL" - Ridge
Video games are a medium comprised of two main components: characters and/or objects usually accompanied by scenery which are all displayed on a monitor or television; and a player, or gamer if you will, who moves the game's focal character or object through tactile input via buttons pressed on a controller by the fingers. Or sometimes feet if dancing is your thing. Perhaps your favorite Fire Emblem game has the barefoot main character, who knows.
Video games are played and loved by many around the world, and that reaches even the heights of Skyland where YOU and Palutena partake in playful rounds of Super Smash Sisters for Nintendo 3DS. Oftentimes, if not every time, this pastime involves a wholly different kind of smashing in the bedroom. When Pit and Dark Pit later accompany them (not in the sexual sense as far as is known) the game rounds become somewhat more competitive, and this nature carries over to the angels trying to outdo one another in cooking Palutena the better breakfast. Regardless, YOU and the goddess still manage to eat more than just the breakfast in bed, marking this as only the first instance in which these pastimes become a pattern throughout the Mushroom City Universe.
While video games are in fact real outside of the MCU, they are also very real in universe in more ways than one. Their very existence is contested in 8: Skype Sex --- Lucina x Ridge when Nite jumps in Ridge's car and the Koopa exclaims that they are real. He assumes this because he saw what appeared to be Lucina on Skype video chat, but it is unclear exactly why he is so certain the girl in blue actually exists outside of her video game origins. Even more unclear is why he at first questions this reality given that he himself is a Koopa and not a human. This story's sequel continues the pattern of video games, smashing, and breakfast when Papa Lentry interrupts his son's very real and inimate not video game session with Lucina to inquire the whereabouts of the pancake griddle.
Video games are also a hot topic of debate, made clear in Bowling when Bullet Bill and Shy Guy argue over which version of Sonic 3D Blast has the better soundtrack. This debate fizzles out, however, when both parties apparently decide to settle on a bowling match. At this point it is proven that video games are at least better than their cartoon counterparts when the two friends witness Oogtar being devoured by the Leviathan. Later, during the F-Zero Grand Prix which Bill and Shy Guy commentate, Bill becomes increasingly upset over the waning legacy of the F-Zero franchise while Shy Guy gives praise to Mario Kart's continuation. They are able to reach a respectful agreement once Bill airs his grievances and Shy Guy attempts to console his friend, although it is extremely likely that these two will continue to debate the finer points of seasoned gaming.