So we are saying our favorite games of all time, huh? I'll list my Nintendo ones for the sake of brevity.
Super Mario Galaxy & Super Mario Galaxy 2 will likely always be my top games of all time. I fluctuate on which one I prefer (since Galaxy 1 has the better story, tone, and art direction I feel, while Galaxy 2 has better level design), but I usually put them as equals.
• Super Mario Galaxy
• Super Mario Galaxy 2
• Donkey Kong Country: Tropical Freeze
• Donkey Kong Country Returns
• The Legend of Zelda: The Wind Waker HD
• Metroid Prime 2: Echoes
• Pikmin
• Pikmin 2
• Pikmin 3
• Pokémon Platinum
• Pokémon White
• Super Mario World 2: Yoshi's Island
• Super Smash Bros. Ultimate (though maybe Brawl still for some reason)
As an aside, I have list of my most wanted to play Nintendo games. I have a feeling some of these would be in my all-time favorites, but I either haven't gotten around to them or have no means to access them.
• Paper Mario: The Thousand-Year Door
• Donkey Kong Country 2: Diddy's Kong Quest
• Super Mario Sunshine
• Pokémon HeartGold
• Mother 3
• F-ZERO GX