These patches will modify a Sega Smash Pack ROM so that it boots either straight to the main menu (skipping all the introduction screens), to Golden Axe, to Ecco, or to Sonic Spinball.  It's done by modifying the branch (bl) instruction at 0x1db4 to jump to the code sections of each game.  Done using the wonderful disassembly tool in VisualBoyAdvance-M.

If you want to use these patches as basis for hacks of your own, feel free.  I think Golden Axe is the best game on the cartridge and would be a wonderful candidate for a restoration, but that's just me.

Credits:
EvilJagaGenius (me)
VisualBoyAdvance-M devs for their emulator and all the tools packed in it
ROMHacking.net for hosting this hack

No-Intro name:  Sega Smash Pack (USA).gba
ROM size:  8,388,608 bytes
CRC-32:  5c2e97ba

Enjoy!
-Jaga

eviljagagenius.blogspot.com