The Switch will have no backwards compatibility with Wii U discs or 3DS cartridges, no comment on mobile games : r/wiiu
Is Nintendo Switch Backwards Compatible? Can you play Wii, Wii U or 3DS games? - Daily Star
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Is Nintendo Switch Backwards Compatible? Can you play Wii, Wii U or 3DS games? - Daily Star
Nintendo Switch Not Backwards Compatible with Physical Games
Nintendo Switch vs. Wii U
Wii U backwards compatibility explained: How to play Wii or older games on the current-gen console
NO NINTENDO SWITCH WII U & 3DS BACKWARDS COMPATIBILITY - YouTube
Nintendo Hints At Switch 2 Backwards Compatibility - Gameranx
How Nintendo Switch Backwards Compatibility Works - GameSpot
Nintendo Switch vs. Wii U
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Nintendo Addresses Lack of Switch Backwards Compatibility - IGN News - IGN
KoopaTV: Stupid Gaming Journalists Confirm Nintendo Switch's Lack of Physical Backwards Compatibility
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Can You Play Nintendo Wii Games on the Nintendo Switch?
Nintendo Switch not backwards compatible with physical 3DS or Wii U games | Shacknews
Nintendo Switch not compatible with physical 3DS or Wii U games – Destructoid
Can You Play Nintendo Wii Games on the Nintendo Switch?