I'll go with Chaos from the DS remake of FF3 - and the preceding dungeon crawls.
Any boss fight with double turns, ability to TPK you with those turns at will, and erratic turn orders is a bitch to beat - and in FF3 you have to take 5 of those in a row. Without saving. Joy.
Warning: The preceding message may or may not have included sarcasm, cynicism, irony, full stops, commas, slashes, words, letters, sentences, lines, quotes, flaeed gramar, cryptic metaphors or other means of annoying communication. Viewer discretion is/was strongly advised.







