hiya, assuming it's as described with tiles spawning on spawn point, create an instance variable on the spawn point object. Then have on start of layout 'for each spawn point' set instance variable to choose(1,2,3,4). This will give each spawn point a random number. Then you relate the number to created tile i.e. if spawnpoint.variable=1 spawn block A, if spawnpoint.variable=2, spawn block B etc