NYUKNYUK in the password screen to enable debug mode in Jurassic Park (Genesis)
Play 19, 65, 09, 17 in the sound test to Sonic 2, then go back tothe menu and hit A+Start. Level select.
I came here to post teh Aladdin (Genesis) Level skip, but was beaten to it. So here's the debug mode I had memorized all these years: A, C, A, C, A, C, A, C, B, B, B, B (at the menu)