I'd say my favorite game to play in co-op would be Super Smash Bros. Ultimate. I'd say it's my favorite simply due to the amount of content, complexity, and sheer amount of ways to play. Particularly, the amount of characters really stands out to me. As someone who's played every Smash Bros. game before Ultimate (excluding Smash Bros. for the Nintendo 64 - the first one), seeing all the characters that I've come to enjoy over the years was really exciting to me. As for a memorable moment, during high school, my friends and I would often get together to play a few matches during lunchtime. I was almost always in second place out of my three other friends, even though I practiced a lot to become better. My friends usually stuck to one or two characters - one friend played Yoshi and King Dedede, another played Fox and Wolf, and my last friend played Corrin. I usually played Ike, and occasionally Robin. I remember one match in particular, where I was on my last stock (life), where I was so, so close to winning. My hands were sweaty and I was extremely focused. I ended up losing so devastatingly that I ended up screaming "NO!" so loud that it echoed across our entire lunchroom. It was a very awkward silence after that... Luckily, the bell to pack up and head to our next class saved me from any stares that could have happened.