iceberg levels tiers

DOOM 64 TNT WAS GOING TO BE FREE DOOM CLONES DAISY; I SUCK AT MAKEING MAPS NIGHTMARE SPECTRE 30,000 LEVELS DOOM ENTRENAL PISTOL; POL WAD DOOM 3 SHOTGUN BREATH OF HORROR AT 300 SPEED IS SOMEONE CHANTING; DOOM RPG CACODEMON SPECTER BABYS CRYING COLUMBINE.WAD; LOST SOUL BETA DESTINE OGXBOX LEVELS IMPOSSIBLE TORCH SECRET; NIGHTMARE IMP IN PSX DOOM MAP 21 IS A REFENCE TO KURT COBANS SUICIDE DO NOT PLAY.WAD