Note that the code explained above must be run separately for each platform, otherwise a random animation will be selected but every platform will use the same random value 
You’ll need a for-each loop event:
[code]Conditions: At the beginning of the scene
Actions: No actions
// Sub-event
For each Platform:
// Sub-sub-event
Conditions: No conditions
Actions: Do = Random(3) to the animation of Platform[/code]
(Assuming there’re 4 animations).
For the limits, they are global values, for example is the left limit is 0 the camera won’t be able to move to the left passing the 0, which is the scene origin point in X (where the black rectangle starts). The same for the other values, explained with images here: [url]Besoin d'une équipe pour votre projet de jeu?]