PSO Levels?

[Pink Bat Maxine]

I've heard that the original PSO levels are available to play...... and I see the last one's textures used in The Fourth System. How do you get to those levels? Lotsa good times I had there, it would be fun to return.

[Anduril]

Well, certain blocks from the PSO levels are available from the mission Maximum Attack G' from the Normal Mission Counter on the Colony 5th floor, plus the Rare Free Missions are blocks from the original PSO levels, though just with close analogues for the enemies, with Forest of Illusions being Forest, Phantom Fissure being Caves, Illusionary Shaft being Mines, and the as-of-now unreleased Holy Hallucination(localized name still pending) being Ruins. And technically The 4th System does use the same skin as Ruins, it just looks similar.