Appearing Block

Appearing Block (出現ブロック), also known as Yoku Block, Disappearing Block and Disappearing Tile, is a recurring obstacle in various Mega Man games, notably the original Mega Man series. Appearing Blocks are temporary platforms which appear and disappear is 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.

Appearances

 * Mega Man - Elec Man stage and Ice Man stage
 * Mega Man 2 - Heat Man stage
 * Mega Man 3 - Magnet Man stage and Wily Stage 1
 * Mega Man 4 - Wily Stage 1
 * Mega Man 5 - Proto Man Stage 1
 * Mega Man 6 - Wily Stage 2
 * Mega Man 7 - Burst Man stage, Wily Stage 3
 * Mega Man 9 - Plug Man stage
 * Mega Man 10 - Sheep Man stage
 * Mega Man & Bass - Astro Man stage, King Stage
 * Mega Man: Dr. Wily's Revenge - Elec Man stage and Wily Stage 2
 * Mega Man II - Top Man stage, Magnet Man stage, and Wily Stage
 * Mega Man III - Midstage
 * Mega Man X2 - X-Hunter Base, before Violen
 * Mega Man X5 - Last stage, before Sigma
 * Mega Man Zero - Neo Arcadia Shrine
 * Mega Man ZX - Area N
 * Mega Man Network Transmission - almost every stage

Trivia
In the fangame Mega Man Unlimited it is said that the "secret" Robot Master Yoku Man is the master of controlling the disappearing blocks.