I forgot:

Xbox Series S - Witcher 3

Despite all the good games, Wii U is still my least favourite Nintendo console. I really dislike the gamepad so I used the pro controller for most games, but still, least fav. I had more fun on the Wii as my first Ninty home console.

Switch is by far the best device Nintendo has released imo, I refused to play botw on Wii U I wanted the better experience on the switch.

There isn't a big difference between the WiiU and Switch release of Breath of the Wild, largely aided by the stylized and simplistic visuals.
Both games drop to 20fps thanks to it's double buffer.

Resolution on the WiiU is 720P on the TV, 480P on the handheld.
Resolution on the Switch is 900P on the TV, 720P on the handheld.

Visual makeup of both games are identical. WiiU TV mode is basically identical to the Switch in Handheld mode.

Game is otherwise brilliant on either machine. I enjoyed the WiiU when I got it at the end of it's life, especially for the price and grabbing Mario Kart 8, Smash, Breath of the Wild, Twilight Princess HD, Wind Waker HD and Xenoblade X... Got tons of fun out of it before the Switch came into it's own game-library wise.

PSOne: Toy Story 2

Xbox: Halo, JSRF+Sega GT 2002

PlayStation 2: Singstar Party and Singstar '80s

Xbox 360: Dead or Alive 4, Project Gotham Racing 3

PSP: God of War: Chains of Olympus

PS3: Metal Gear Solid 4

DS: Pokemon Soul Silver

Wii: Super Smash Bros. Melee

3DS: Legend of Zelda: Ocarina of Time 3D, Kid Icarus: Uprising, Resident Evil: Revelations

Xbox One: Ryze, Dead Rising 3, Forza Motorsport 5

PS4: Killzone: Shadowfall

PS Vita: Gravity Rush, Soul Sacrifice, Ys: Memories of Celceta

WiiU: New Super Mario Bros. U+New Super Luigi U, Mario Kart 8, The Legend of Zelda: Wind Waker HD

JP PlayStation 2: Xenosaga trilogy

JP WiiU: Xenoblade X

Switch: Super Mario Odyssey

PS4 Pro: Monster Hunter World

Xbox One X: DOOM(2016), Forza Horizon 3.

Xbox Series X: Devil May Cry 5: Special Edition, Marvel's Midnight Suns, Deathloop


*I could add that I also bought another 360 in the Modern Warfare 2 bundle, because I had so many red ring that I actually wanted a spare. I lent the original (of the survivors) to a friend later and never got it back.

That actually reminds me I still haven't re-bought Breath of the Wild on Switch since then. And naturally is still hasn't dropped in price. If I have 2 cents left to rub together after PC Build Hell I'd better make sure to pick a copy up before the Switch 2 launches.

If Nintendo have any up-res technology or other improvements planned for Switch 2's backwards compatibility (which is honestly kind of wishful thinking, but still) Breath of the Wild and Tears of the Kingdom will likely be some of the first showpieces, so those copies will start flying off shelves soon. Probably can't afford to wait too long. Same goes for any other WiiU OGs.

PS1: Gran Turismo 2
PS2: Darkcloud
PS3: Assassins Creed
PS4: inFamous Second Son
PS5: God of War Ragnarok

Xbox 360: Viva Pinata

SNES: Super Mario World
N64: WCW vs NWO
GBA: Pokemon Crystal
Wii: Super Paper Mario
Switch: Mario Wonder

Atari 2600: River Raid

Master System: Alex Kid in Miracle World
Mega Drive: Sonic 2
Saturn: X-Men-Children of the Atom
DC: Sonic Adventure 1

X360: Mass Effect 1

PS1: FF8
PS2: GT3
PS3: Fallout 3
PS4: Infamous Second Son
PS5: Elden Ring
PSP: Kingdom Hearts Birth by Sleep
PS Vita: Murasaki Baby

NES: Gauntlet
SNES: Super Mario World
N64: Mario 64
GC: Luigi's Mansion
Wii: Wii Sports
Wii U: Nintendo Land
SW: Mario Odyssey
GBA: Super Street Fighter 2-Turbo Revival
DS: FF9
3DS: Kid Icarus Uprising

PC: GP2

nvm you said acquired not played, I have no idea/too lazy to remember lol

Some of these get messy based on memory of acquired/played first
GameCube: Luigi's Mansion or Pac-Man World 2
I'm struggling to think of the very first one I booted up. I can narrow it down to a few. There were several of us kids, so we got several games with the Cube.
GBA: Super Mario World: Super Mario Advance 2
N64: Probably Ready 2 Rumble Boxing
Wii: Besides Wii Sports, I went straight to Super Mario Galaxy
DS: It would have to be Diddy Kong Racing when I used my brother's DS Lite. But when I got my own (a DSi), it would be Mario and Sonic at the Olympic Winter Games
Genesis: The Lion King
3DS: Pilotwings Resort
Wii U; Mario Kart 8
Switch: The Legend of Zelda: Breath of the Wild
PS4: Marvel's Spider-Man
PS Vita: Jack N’ Jill DX
PS3: MLB 13 The Show: Home Run Derby Edition
PS5: Astro's Playroom
Xbox 360: Project Gotham Racing 3
Xbox One: Crimson Dragon