Luna would suck at video games, whatever the more popular fanon is. Think about it: she's been in the moon for 1000 years, video games in our world have really only been around since the 80s, so a teeny blip in a very long time for Luna. She's also not super big on being modern and video games wouldn't exactly be a priority

Luna's getting upset here though, judging by her expression. Twilight looks like the one who's trolling judging by her expression. Celestia's just getting amused at her sister's frustration. And Cady is being as graceful as ever stuffing her face, though she also kind of looks like she's mid laugh. The fact that Cadance is snacking makes me think that this is either a game where you take turns (ala Mario Party) or a turn just ended (end of a race in Mario Kart, though they're holding the controllers wrong for Mario Kart, or post victory Smash, though again with the incorrect controllers for Smash). Overall cute picture <3