In case you can't see the tweets, the games are (which include free-to-play/free-to-start games for whatever reason)...
- Fortnite *
- Fallout Shelter *
- Paladins *
- Super Smash Bros. Ultimate
- Warframe *
- Arena of Valor *
- Minecraft
- Hollow Knight
- Super Mario Party
- Celeste
- Mario Tennis Aces
- Pokémon: Let's Go, Eevee!
- Pokémon: Let's Go, Pikachu!
- Dead Cells
- Overcooked! 2
- Octopath Traveler
- Undertale
- Kirby Star Allies
- Diablo III: Eternal Collection
- Wizard of Legend
- Donkey Kong Country: Tropical Freeze
- Okami HD
- Darkest Dungeon
- Crash Bandicoot N. Sane Trilogy
- Shovel Knight: Treasure Trove
- Golf Story
Source: Nintendo News (the official news channel in the Switch's News section, screenshots taken by me & posted via my Twitter)
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