A continued and essential step in development here, paper prototyping continued to be used by teams throughout the Game Jam to establish structure, fine tune mechanics, and design level layout and puzzles. Those with very detailed paper prototypes use them as a reference for development of most of their game, ensuring they are following the exact specs they originally laid down in early planning. Paper prototyping is an element constantly stressed in the game development courses at my school, SFU, and it's interesting to see just how universal that belief is.
Above, Bruce McLavy, Andrew Pope, Peter Gao and Samppa V. Raski of team Blobboy concentrate on their level designs.