People are going to say Tetris, but they are wrong. There are hundreds of variations of Tetris all with different mechanics and gameplay elements, from the way the pieces move, to the way the next random piece is selected, most people just don't notice them. I'd recommend anybody who likes Tetris to play a round of Tetris Grandmaster 2 Plus and you'll see that the "standard" Tetris we get copyrighted from the Tetris Company is far from perfect. TGM really just feels fantastic and after playing it it genuinely feels hard to go back.

Two games I'd consider as-close-to-perfect as you can get are Outrun 2006 and F-Zero GX. Outrun 2006 is just perfect arcade fun, drifting at 200mph through those extremely varied environments with those cheesy vocal tracks is a complete blast (the minigame mode adds great variety as well).

F-Zero GX is just mechanically incredible, with the manual boost, boost pads and your cars energy providing a perfect risk-to-reward system with incredible tracks that feel perfectly designed to take advantage of the mechanics and all feel different. Then there's the games infamously high difficulty which turns every race into a High-Speed-high-adrenaline-rush. Not to mention the fantastic music, the story mode with really characterful cutscenes and and the dozens upon dozens of unlockables. I don't think there has ever been another racer that feels als fully featured as F-Zero GX, it truly feels like a swan song for the series, it's as perfect as games get.