Retro-Bit's GoRetro! Portable device has 261 different games built in, including Tetris and Capcom classic. Read our review of the handheld here.
Is there any conceivable way to replace the ROMs on 400-in-1 Handheld Console? : r/SBCGaming
Retro-Bit Go Retro Portable Game
RG351V Handheld Game Console 3.5 Inch Portable Double TF 64G Card Handheld Retro Video Game Built in WiFi Game Console U.S. Seller!!! (Anbernic RG351V Gray) : Toys & Games
Review: Retro-Bit SEGA Genesis BIG6 Arcade Pad (Wired Console & 2.4 GHz Wireless versions) » SEGAbits - #1 Source for SEGA News
Go Retro! Portable Gaming Console : : Video Games
Retro-Bit RetroDuo User Guide (PDF) : Retro-Bit : Free Download, Borrow, and Streaming : Internet Archive
Go Retro Portable, Blue
Working on a SS13 inspired PDA as an electronics project. = : r/SS13
Retro Bit Go Retro Portable Review Gameplay Teardown
Go Retro Portable - White/Red