Talk:The Guardian Legend/Corridor 21

There are a couple of things I learned during a play through.

You actually do not need all the corridors to be complete to get to Corridor 21. It's open once you get through Corridor 10.

Also defeating the last boss, all you need is the fireball to be at level 3. You don't need the Erasers at all during the fight. Just keep firing the laser and be careful not to be underneath the boss. He's real simple that way.