Most games are played in turns. One turn of game time is a varying amount of real time. Each player takes a turn, according to the rules of the game. The actions that one player may take during another's turn are usually strictly limited. Zendo and Martian Chess are examples of Icehouse games that are played in turns.
In a real time game, there are no turns. Players play according to the rules as quickly or as slowly as they think is necessary, with one second of game time taking up one second of real time. Most sports are real time games. Icehouse and IceTowers are examples of Icehouse games that are played in real time.
See also the page Category:Turnless.