Tanglewood is an indie game developed using an original Mega Drive development kit. As you can imagine, there were many technical issues during development.
Crash Handler#
If the game ever crashes, it'll display this crash handler. The text for it can be found at 0x71E in the ROM.
D0:
D1:
D2:
D3:
D4:
D5:
D6:
D7:
A0:
A1:
A2:
A3:
A4:
A5:
A6:
SP:
SR:
PC:
ADDRESS ERROR :(
BUS ERROR :(
ILLEGAL INSTRUCTION:
DIVIDE BY ZERO :(
UNHANDLED INTERRUPT:
UNHANDLED TRAP :(
UNHANDLED EXCEPTION:
STACK:
OUT OF VRAM :((Source: Ferrox)
Build Date#
Present at 0x2CE in the ROM is a build date.
5/9/2018(Source: Ferrox)
Developer Messages#
Present at 0x1DAAB7 in the ROM are a couple of developer messages.
The Quick Brown Fox Jumps
Over The Lazy Dog
Is this on? I made a Chronal
Accelerator, I'm sure I can do this.(Source: Ferrox)
Level Select#
At the copyright screen, press and hold Left+Start until the main menu appears. The cursor will be red instead of green if done correctly. Now go to the sound test and play SFX numbers 19, 65, 09, 17 (Yuji Naka's birthday and a reference to Sonic 2's level select code). If done correctly, a level select option will be added to the main menu.
(Source: GameFAQs (_0blivion_))