Hot Lava is a game played by kids of all ages, in which the players imagine that the floor or ground is made of lava, or variably as any other unsavory substance, such as acid or quicksand, and thus avoid touching the ground lest they get burned or otherwise injured. The players stay off of the floor by standing on furniture or the room's architecture. The players generally do not remain still, moving from one piece of furniture to the next. The game can be played with a group or alone for self amusement. There may even be a goal, to which the players must race. The game may also be played outdoors in playgrounds or similar areas. Players can also set up obstacles to make the game more challenging. This is a variation of an obstacle course. Typically, any individual can start the game just by shouting "The floor is lava!". Any player remaining on the floor in the next few seconds is "out" and can not rejoin the game for some period of time. This game has become increasingly popular among older children and teens in the past few years.