The Gateshead Engine is a tarot-based journaling rpg about whether you really should have built that steampunk mech.
The PDF is 4 pages, with a bare-feeling, but easy to read layout.
You play by establishing some basic facts about your setting and the mech you are building, and then you draw from the tarot deck and journal the results.
Unlike other games of this type, Gateshead *really* gives you a lot of room to interpret the prompts served up by the deck, and it's the kind of game that you could spin a whole novel out of. However, if you're looking for a more quick and guided experience, this doesn't really steer in that direction.
Overall, if you're looking for a push to do some really intense writing, I'd strongly recommend picking this up.