Region Lock

Summary

As the name implies,region lock is when things are "locked out" of a country. It may be just one country or maybe multiple.  Many games are known for staying in Japan.  

List of Region Free Consoles/Handhelds

• GameBoy 
• Sega Game Gear 
• GameBoy Color
• GameBoy Advance
• Nintendo DS/DSi/DSi XL (With the exception of DSi only games)
• PSP (With the exception of UMD Movies)
• PlayStation 3 (Except for Persona 4 Arena and Way of the Samurai 3)
• PS Vita
• PlayStation 4 (Except digital games)
• Xbox One
• Nintendo Switch
• PlayStation 5
• Atari 2600 (NTSC games can display wrong colors, slow speed and sound on PAL systems and vice versa.)
• NES-101
• SG-1000
• Atari 5200
• Atari Jaguar and Jaguar CD
• Atari Lynx
• Sega Saturn (Japan only)
• Phillips CDi
• Panasonic/Sanyo 3DO
• Neo Geo Pocket and Color
• Microsoft Windows/PC (However digital content and online games from online stores such as Steam and Epic Games can be region locked)
• VHS (However playing PAL tapes might run into issues or not play on NTSC VCRs; so it is recommended to play it on a universal VCR)
• Audio Casettes
• Phones/Mobile Devices
• Virtual Boy
• Apple PC (since Apple II)
• Neo Geo, Neo Geo CD, and Neo Geo CDX
• Magnavox Odyssey and II
• Intellivision
• ColecoVision
• NEC Turbografx/PC Engine CDs (excluding system cards)
• Amiga/Amiga CD32
• Atari VCS
• Net Yaroze (PS1 dev kit)
• Vectrex
• Atari ST
• Commodore 64
• Pioneer Laseractive
• All western Masters System consoles (US/Europe/Brazilian/Australian are universal, but a tiny handful of games either don't play or are glitchy on a US system)
• 4K UHD Blu-Ray
• Sega Naomi
• M.A.M.E. / Arcade Machines
• Fairchild Channel F
• Plug N Play
• Sega Pico
• Hyperscan
• XM Radio
• Printers
• HP Printers (Before 2004)

List of Region Locked Consoles/Handhelds

• PlayStation
• PlayStation 2
• GameCube
• Microsoft Xbox
• Xbox 360
• Wii
• Nintendo 2DS/3DS/3DS XL/New 3DS/New 3DS XL 
• Wii U
• NES/Famicom
• Atari 7800 (except backwards compatibility with 2600)
• SNES/Super Famicom
• Nintendo 64
• DVD
• UMD
• Blu-Ray
• Sega Master System Mark III (Japan only)
• Sega Genesis/MegaDrive
• Sega CD
• Sega 32X
• Sega Dreamcast
• Sega Nomad
• Television Cable
• Streaming Services
• Antenna TV
• Satellite TV (Only covers a portion of the world depending on where you live and what service)
• AM/FM/WX Radios
• HP Printers (After 2004)