Taz in Escape from Mars Cheats
for Genesis

Cheat Mode

At the Sega logo screen, hold A + B on Controller One while holding B + C on Controller Two. If you did this correctly you'll hear a bark.

To use the code, pause the game while playing and press A. A menu will appear where you can restore your health and jump to any level.

Invincibility in Haunted Castle and Beyond

After putting in the secret menu, at Mexico three, use XY mode untill you beat the bull.  When you get to Haunted Castle, you will be invincible.  Even when you are at Marvin's House you will be invincible.

NOTE: Once you use XY mode again the invincibility code will wear off.  Also beware, you will not be invincible to spikes, fire, and chemicals.  You can't spin at any enemies also.

Invincibility

At the end of any level with an exit sign, use XY mode after you have eaten
the exit sign and leave it like that. If it worked, Taz will stay frozen
and the level ending music will play. In the next level, you will be
invincible until you use XY mode again.