Ludum Dare is a worldwide game jam where games are made from scratch in a weekend and Ludum Dare 49 will be running from the 1st to the 4th of October (that's f...
can i use existing games for the jam
The idea of Ludum Dare (as said in the first line of the post) is to make games from scratch in the jam.
Take a look at the rules: ldjam.com/events/ludum-dare/rules