Most video games designated as part of the region will not play on NTSC-U/C or NTSC-J region consoles because of regional lockout. While this is the most common occurrence, some Xbox and Xbox 360 games are region-free encoded, since Microsoft's policy is for publishers to decide. Sony has a similar policy for the PlayStation Portable, but most publishers choose not to encode a region on their UMD games. With the exception of Persona 4 Arena, PlayStation 3 Blu-ray Disc games are region-free. All Nintendo home consoles have region locking either by software encoding or physical differences in media and consoles. Nintendo handhelds are region-free, along with most other historical systems (Neo Geo Pocket, Sega Game Gear, etc.), except partially for the Nintendo DSi and fully for the Nintendo