Sega Mega Drive Collection [Model SLES-54333]

To unlock the arcade version of Altered Beast, play every game in the lineup including the other unlockable arcade titles.

To unlock Future Spy, complete episode 1 on Comix Zone.

To unlock Tac/Scan, get to the bonus stage in the first level of Ristar.

To unlock Zaxxon, collect one Chaos Emerald while playing Sonic the Hedgehog. To collect a chaos emerald, collect 50 rings during the course of a stage, then jump through the giant ring at the end. Once inside, you can collect the emerald and unlock Zaxxon.

To unlock Zektor, clear Level 2 in the Mega Drive version of Altered Beast.