Boobeam Trap

Buebeam Trap (ブービームトラップ Bu-bi-mu Torappu) is the fourth Wily stage boss of Mega Man 2. This is considered by many (if not most) players as the most frustrating boss of the game, as its only weakness is Crash Bomber and there are a lot of walls that can cause a player to waste a shot (two of which are absolutely required to destroy, but the others can be circumvented). This either requires strategy (using Item 1 and Item 3 to get around) or willingness to sacrifice a life (as long as there are plenty in reserve) to defeat.