Select two previously existing LD entries ( see them here: The Grid ), and make a game that combines them! One of the two may be your own entry if you wish, but they can’t both be.
What does it mean to mash up two games? That’s up to you! Maybe you’ll have the player from one game face the enemies and world of the other game, or you’ll combine gameplay elements from both, or you’ll steal the theme and setting from one game and the gameplay of the other. It’s up to you! Use whatever you want from the two games to create a horrifying two-headed freakbaby! Your game can be remarkably similar to one of them, a perfect blend of both, or nothing like either, as long as deep in your heart you were intending to combine them.
Standard LD rules apply, so even though you are working from someone else’s ideas, you’ll have to create all the art, sound, and code yourself rather than stealing theirs. So find your two favorites, and get to work!
You have until 3pm PST on Sunday to get ‘er done!