Sonic's Secrets: Bari-Arm / Android Assault.

To activate the cheat mode, press:

Up, B, A, C, A, Down, B, A, C, A.

whilst on the title screen. (see right)

You will hear a noise if the cheat has been entered properly.

Activate the cheat mode above then go to the options screen. Pressing Left twice will bring up a new options screen (see right) with loads of cheats.

Activate the cheat mode above, now whilst playing you can skip to the next level by holding A and pressing Start twice.