What Happens If You Put an N64 Cartridge in a Wii?

Nothing—it physically won't fit.

• Media: N64 uses 4.5″ cartridges; Wii uses 12 cm optical discs (DVD).
• Slot: Wii has a front-loading disc drive; no cartridge slot exists.
• Architecture: N64 = MIPS III (NEC VR4300); Wii = PowerPC (Broadway). No hardware compatibility.

How to Play N64 Games Today

• Nintendo Switch Online + Expansion Pack – official library (Mario 64, Ocarina, Goldeneye, etc.) with save states, online multiplayer.
• Wii / Wii U Virtual Console – purchased titles (service closed; redownload only if previously bought).
• Original N64 + CRT / HDMI mod (UltraHDMI, RetroGem) for authentic hardware.
• PC / Mobile Emulation – Project64, Mupen64Plus, RetroArch (legal with own ROMs).

Don't force anything into the Wii disc slot—you'll damage the drive.