Randomly appearing object

[MdNelson]

How do I get an object to randomly appear visible, and then stay visible for a random period of time?

[ChrisBurrows]

A very simple solution:

Have a counter ojbect. Every 1 second set counter to: Random(10)

This generates a random number.

If counter = 5 then set object to visible.

This makes every 1 second there be a 1 in 10 chance of the object being set to visible.

[ChrisBurrows]

To set a random period till the object becomes invisble...

If Object is visible + only 1 action when event loops: then set alerable value A to random(60)

Every 1 second: subract 1 from alerable value a

If alterable value a = 0. set object to invisbible