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.