really i walked into that 4-1 boss room last night,looked left and right and was killed instantly by a big sword,lol
going back now
the fools boss in 3-1 i think is the easiest that i've come across so far aswell as 1-1 and and the 5-1 i think it is,but then i suppose 1's are not supposed to be hard,i think 4-1 is the hardest of the 1's