Appearing Blocks (出現ブロック,Shutsugen Burokku?), also known as Buzzing Blocks (ブーンブロック,Būn Burokku?, also written as ブンブロック), Vanish Block, and "Yoku Blocks", are recurring obstacles in various Mega Man games, notably the original Mega Man series. Appearing Blocks are temporary platforms which appear and disappear in a specific pattern at a set interval (usually one second). The player can stand on them while they are solid. Groups of them form block patterns which often require memorization to pass and are considered some of the hardest obstacles required to pass without using special items or Rush. They are usually found with hazards such as spikes, enemies and bottomless pits.