IPod game steps towards entering the video game handheld console market. Even video game magazines like GamePro and EGM have reviewed and rated most of their games. The games are in the form of .ipg files (iPod game), which are actually .zip archives in disguise. When unzipped, they reveal executable files along with common audio and image files, leading to the possibility of third-party games. Currently, Apple has no publicly available software development kit (SDK) for iPod-specific development. The iOS SDK covers only iOS on the iPhone and iPod Touch, not traditional iPods. As of October 2011, Apple has removed all the
IPod Touch to the iPod Touch as "training wheels for the iPhone". All iPods lack Touch ID, 3D Touch, NFC, GPS, an earpiece speaker and a noise-cancelling microphone. Depending on the generation, the iPod Touch may have a smaller or inferior display and camera(s). Newer models (5th and 6th generation) lack the ambient light sensor that makes automatic brightness available. Older models lack a built in speaker, a microphone, a camera, and a flash. No iPod Touch has a modem through which it can place phone calls or send SMS and MMS. However, 5th and 6th generation models can either piggy-back on