I believe The Beatles: Rock Band came the closest to being perfect. Eveything about that game was just beautifully done and the only things missing was Pro Drums, an option for Keys, and a few more Beatle songs (Hey Jude, Strawberry Fields Forever, Yesterday etc. etc.)
Maybe Tetris? Such a simple concept, and it’s one of the most popular games of all time.
Minecraft for similar reasons. Even if it has become more complex in recent years, the core of it is just…you can break everything and build anything. It’s hard to say that isn’t a perfect sandbox.
More personal opinion though, maybe Super Mario Odyssey. Just incredibly polished and varied with an amazing movement system.
Tetris is an interesting one because you’ve got 3+ decades of variations on the original, but the original is still the best. I’d argue it’s a perfect game.
I personally disagree that the original is best. It’s high up there, but I think some of the later titles have improvements that eek out the #1 spot.
I’m a fan of the “piece swap” feature, and later games have polished the piece lock over the original. Tetris 99 was the sweet spot for games that I’ve played.