How do I make a random enemy spawn a key

In my game i have 4 different enemies. When the player kills an enemy they spawn a key that opens a chest.

I'd like to be able to have a different enemy spawn that key. EXAMPLE: player kills enemy 2, they spawn the key. If the player quits the game and restarts or passes that level on the next level(s) enemy 4 will spawn the key.

Thanks for any help.

In my game i have 4 different enemies. When the player kills an enemy they spawn a key that opens a chest.

I'd like to be able to have a different enemy spawn that key. EXAMPLE: player kills enemy 2, they spawn the key. If the player quits the game and restarts or passes that level on the next level(s) enemy 4 will spawn the key.

Thanks for any help.

My first thought is to have an instance variable that is a boolean (hasKey - default to no). Then set an event to randomize it

On Layout Start - > pick random instance --> set boolean to yes

Or could do:

On instance destroyed

If instance count > 1

If random(0,1) > 0.75 then spawn key

Else (if instance count is 1) then spawn key

If you're wanting it to always be a different enemy then I would go the instance variable route like badmoodtaylor suggested. You're question sounds like you want this difference across multiple levels (layouts), so you would need to store the enemy number that had key last time in a global and filter him out next spawn.