Appearing Block

Appearing Blocks (出現ブロック), also known as Bun Blocks (ブーンブロック) , Tenmetsu Blocks (点滅ブロック) , Vanish Blocks , or simply 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.

Mega Man (Archie Comics)
Appearing Blocks appeared in the Skull Egg Zone and Wily Egg in Worlds Collide and while the worlds were being merged by the Unity Engines in Worlds Unite.

Other appearances
Appearing Blocks are present in the manga Rockman: Dr. Wily no Inbou, Rockman 5, and Rockman 7.