The levels of Mega Man Classic don't bother me as much until I get to Dr. Wily's Fortress levels.
1) I had to cheat (pause menu Thunder Beam/Rolling Cutter trick) to beat the Yellow Devil and Dr. Wily (I did later come back and beat this on my own without cheating).
7) With the bigger sprites and wonky hit detection, Wily Fortress 1 becomes annoying due to the instant kill furnaces.
8) Getting into the main part of Wily Fortress 1. JUMP JUMP SLIDE SLIDE
9) Wily Fortress 1 and 3. Even with Concrete Shot, it's hard to freeze the instant kill beams in Wily Fortress 1. 3 had an annoying Twin Demon boss.
10) Wily Fortress 1 and 2. I've never gotten any further than the second stage. God damn Weapon Archive draining my items in the 1st stage.
EDIT - Wait. One regular level did annoy me. Quick Man's stage from Mega Man 2. Damn instant kill beams.
EDIT 2 - I forgot about Frost Man's Stage from 8. I hate it for the same reason as Wily Fortress 1 in 8.
1) I had to cheat (pause menu Thunder Beam/Rolling Cutter trick) to beat the Yellow Devil and Dr. Wily (I did later come back and beat this on my own without cheating).
7) With the bigger sprites and wonky hit detection, Wily Fortress 1 becomes annoying due to the instant kill furnaces.
8) Getting into the main part of Wily Fortress 1. JUMP JUMP SLIDE SLIDE
9) Wily Fortress 1 and 3. Even with Concrete Shot, it's hard to freeze the instant kill beams in Wily Fortress 1. 3 had an annoying Twin Demon boss.
10) Wily Fortress 1 and 2. I've never gotten any further than the second stage. God damn Weapon Archive draining my items in the 1st stage.
EDIT - Wait. One regular level did annoy me. Quick Man's stage from Mega Man 2. Damn instant kill beams.
EDIT 2 - I forgot about Frost Man's Stage from 8. I hate it for the same reason as Wily Fortress 1 in 8.