Previously, BGMC’s in late Dec/early Jan haven’t got many participants. But I think mid/end of jan should be good. I guess that means it’s time to start organizing it eh?
No you can not use your own game, if you want to join you need to build a game from scratch from the start time till the end time. You may however use resources from this forums resource section (as long as what you use can be used by anyone who participates in the bgmc)
So start at start date, deliver the game + source files/code before the end date.
It has to be a working game, prototype or full game that does not matter as long as it is a game and working (but a full game would score more points by public).
+1 for everything Cotaks said, BGMC is also about having fun and learning / trying out new ideas / methods / tools. You can use any resource that is publically available (including textures etc.) it doesn’t have to be just from this forum.