My idea: evolving a computer virus
I thought something like a “tamagotchi” would be great. You could nurture it until it can evolve to the next level. Then I thought about which creature (beside teens) behaves that way… of course: viruses! I decided for a *computer* virus rather than a “real world” virus, because then I can get bonkers on how that little fella would look 😀
To get stuff for nurturing it (i. e. code snippets or similar) you must send it down the data highway and shoot code, firewalls, etc.
Let´s see if that is as much fun when it´s done as it is now in my mind!