The Bluetooth Cellphone Gaming Gadget is a great way of transforming your regular Bluetooth Cellphone into a gamepad for easier gameplay.
There have been cool gadgets made for Cellphone Gaming before. One that I immediately recall was the Wireless Cellphone Joystick by Zeemote…

I used to play the original Konami video game Contra on the Nintendo Entertainment System (NES) so much as a kid. Do any of you remember the code: “Up, Up, Down, Down, Left, Right, Left, Right, B, A [for 2 players an additional B, A and then Select] Start”?
This game was so much fun and took up so much of my childhood…