longhand: I submitted a game in the Wish you were here jam (tl;dr: make a game on a single postcard). It took me the better part of the weekend (more struggling with Scribus than writing…) and it was cosy and fun. I am pretty sure there are other IFers here who would enjoy it: in the end there are so many words that fit into a postcard so it is an excellent size to get you started.
tl;dr: my entry, Hunt in Trieste.
