Sonic 3 & Knuckles Codes level Select While in Angel Island Zone, go to one of the vines. While hanging on the vine press left,left,left,right,right,right,up,up,up and you will here the chime. Then in pause, press A . At the title screen select sound test.. Debug First enter level select. select MHZ, then on the pull up machine eneter the level select code and press start and a. then at level select select a level while holding A.