A gate (or key block, or door) is a type of block that reacts in a certain way when a key is touched. There are two main types of gates: normal gates and reverse gates. Normal gates disappear for several seconds when a key is touched, acting like a blank tile, whereas reverse gates appear and gain solidness. There are 6 color types of gates (red, green, blue, magenta, cyan and yellow), each of which only respond to a key of its corresponding color. Many players use them in stairs and bossmaps. Keys and gates were introduced on June 10th, 2010.