Can You Download Games Directly to an MP4 Player?

No. MP4 players (dedicated media players, not smartphones) are not gaming platforms. Here's why:

No Gaming OS: Run proprietary firmware for media playback only—no app store, no executable support.
Hardware: Low-power SoCs (Actions, Rockchip, etc.) designed for video decode, not 3D/2D game rendering.
Input: Typically only 4–5 buttons (play, vol, nav)—no D-pad, touchscreen, or accelerometer for games.
Storage: 2–16 GB typical; games would consume it rapidly.
Format Support: Some play NES/Game Boy ROMs via built-in emulators (often unlicensed), but you cannot "download games" to them like a phone.

Device	Pros
Smartphone (iOS/Android)	Millions of games, touch/controller support, always with you
Nintendo Switch / Switch Lite	Dedicated controls, AAA + indie library, TV dock (Switch)
Steam Deck / ROG Ally / Legion Go	PC gaming handheld, Steam library, emulation
Retro Handhelds (Anbernic, Miyoo, Retroid)	Native emulation up to PS1/N64/DS, cheap, open
PlayStation Vita (used)	PSP/PS1/PS Vita games, remote play, OLED (1000)

Warning: Sites claiming "MP4 game downloads" often distribute malware or fake files. Avoid.

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