Downfall is a two-player game. The game consists of a vertical board with five slotted dials on each side. Each player starts with ten game pieces at the top of the board. The object of the game is to move the pieces to the bottom of the board by turning the dials. Players alternate turns moving the dials and cannot move a dial that their opponent has just moved. The winner is the first player to move all of their pieces into the tray at the bottom. Since neither player can see the other's board, it is common to inadvertently advance - or hinder - the opponent's gameplay. The game rewards forward thinking and planning; players may try to "trap" their opponent into turning a dial that will advance their own disc, while trying to ensure that their own pieces are not caught and dropped.
Since I designed this based off of pictures, this isn't 100% accurate to the original game. I'm not sure of the proper alignment of the dials. Just print 1 each, front and back, and use one of the different connectors to get varying alignments. The ones that go on the front have arrows on them that align with the arrows on the frame, when starting a new game. Also, the play pieces on the original had numbers on them for "advanced gameplay". I thought it was a stupid addition to the game, so I didn't put them on.
I'm sure you can figure out by looking, the 2 pieces of the body need to be glued together. I've included registration pins to make alignment easy. You should also slice and print it first to make sure it will fit on your printer's bed. If it's needs to be reduced, you'll know how smaller you need to go with all the rest of the pieces too, before you waste a bunch of plastic.
The lid is the hardest part to print. You might be tempted to flip it over and print it upside down. If you do, all of the support marks will be on the outside. The way it's sitting now, all those marks are on the underside where no one can see them. You trade a harder print for easier cleanup.