Why do you think the developers of games like Starcraft create smaller sub-games like Starjeweled? Do you know other games that have similar collections like the Starcraft 2 arcade? What are the potential benefits and drawbacks of having sections like this in your game?

Starcraft developers created sub-games like Starjeweled because sometimes the player may get bored of the campaign and would want to play something else. Starjeweled would be that game. It is a game where the player can take a break from the actual game and play something else.